Maker & Model | Front Scales | Back Scales |
---|---|---|

ADF Products (USA) ADF 103 Engineer's Semi-Circular Slide Rule PHOTO | || D, L, DI, S, T, ST, K, R, LL3, LL2, LL1, LL01, LL02, LL03, TH, SH2, SH1, LL0, LL00 || | |

ALVIN (Japan San-Ai Group) ALVIN ELITE VECTOR No. 1157 PHOTO | || Sr, SΘ & SΘ, P', P || Q, CF, CI, C || D, DF, LL2, LL3 || Note: LL1' is at end of C; Sr is radians; SΘ is degrees | || Sh2, Sh1, A || B, K, Th, C || D, Tr1, Tr2, db || Note: db is 20 lg x |

ARISTO (Germany) Made in Hamburg ARISTO HyperboLog No. 971 PHOTO | ||LLo1, LLo2, LLo3, DF || CF, CIF, L, CI, C || D, LL3, LL2, LL1|| | || Th, K, A || B, T&T, ST, S&S, C || D, DI, Sh2, Sh1 || |

ARISTO (Germany) Made in Germany ARISTO HyperboLog No. 0971 PHOTO | || LLo1, LLo2, LLo3, DF || CF, CIF, L, CI, C || D, LL3, LL2, LL1|| | || Th, K, A || B, T&T, ST, S&S, C || D, DI, Sh2, Sh1 || |

ARISTO (Germany) ARISTO HyperLog No. 0972 PHOTO | || LLoo, LLo1, LLo2, LLo3, DF || CF, CIF, L, CI, C || D, LL3, LL2, LL1, LLo || | || H2, Sh2, Th, K, A || B, T&T, ST, S&S, P, C || D, DI, Ch, Sh1, H1 || |

ARQUIMEDES (Brazil) Archimedes Vectolog 21-D | || LLo1, LLo2, LLo3, DF || CF, CIF, CI, C || D, LL3, LL2, LL1 || | || L, K, A || B, T, ST, S, C || D, Th, Sh2, Sh1 || |

BEACON (Korea) BEACON KOREA No. 315 | || L, K, DF || CF, CIF, CI, C || D, LL3, LL2, LL1 || | ||Sh1, Sh2, Th, A || B, TI2&TI2, TI1&TI1, SI&SI, C || D, DI, X, Θq || Note: X is radians; Θ is degrees. |

BLUNDELL (Great Britain) Multilog Vector Duplex No. JV 56 Vector Janus | || LL01, Ll02, LL03, DF || CF, CIF, CI, C || D, LL3, LL2, LL1 || | || Sinh1, Sinh2, Tanh, A || B, T&T, ST, S&S || D, DI, K, L || |

BLUNDELL (Great Britain) Log-Log Electro No. 506 ( Academy Duplex) PHOTO | || LL01, Ll02, LL03, DF || CF, CIF, CI, C || D, LL3, LL2, LL1 || | || Sinh1, Sinh2, Tanh, A || B, T&T, ST, S&S || D, DI, K, L || |

BLUNDELL (Great Britain) Log-Log Electro No. A506 ( Super Duplex) PHOTO | || LL01, Ll02, LL03, DF || CF, CIF, CI, C || D, LL3, LL2, LL1|| | || Sinh1, Sinh2, Tanh, A || B, T&T, ST, S&S || D, DI, K, L || |

CHINA BEIJING 6581 Haiou Pai (Seagull) PHOTO | || LL01, LL02, LL03, DF || CF, CIF, CI, C || D, LL3, LL2, LL1 || CF is folded at π | || Sh1, Sh2, Th, A || B, T, ST, S || D, DI, K, L || |

CHINA BEIJING 6631 Haiou Pai (Seagull) PHOTO | || LL01, LL02, LL03, DF || CF, CIF, CI, C || D, LL3, LL2, LL1 || CF is folded at π | || Sh1, Sh2, Th, A || B, T, ST, S || D, DI, Ch, L || |

CHINA BEIJING 6681 Haiou Pai (Seagull) PHOTO | || Ln01, Ln02, Ln03, DF || CF, CIF, H, CI, C || D, LL3, LL2, LL1 || CF is folded at π | || L, Sh1, Sh2, A || B, T, ST, S, C || D, P, Th, Ch || |

CHINA BEIJING LIXUE No number | ||

CHINA SHANGHAI Cultural Revolution Slide Rule 1002 | ||

CHINA SHANGHAI 1015-1 | ||

CHINA SHANGHAI 1018 | ||

CHINA SHANGHAI 5891 | ||

COMPASS (JAPAN San-Ai Group) No. 1325 PHOTO | || Sr, SΘ, P', P || Q, CF, CI, C || D, DF, LL2, LL3 || Note: LL1' is at end of C; Sr is radians; SΘ deg | || Sh2, Sh1, A || B, K, Th, C || D, Tr1, Tr2, db || Note: db is 20 lg x |

DAVIS Davis-Pletts PHOTO | || Lg, A || B, LL, D || C LL || | || || Sh, Sin, Cos, Tan, Cot, Coth || || |

DIETZGEN (USA) Vector Type Log Log No. 1735 Maniphase Multiplex (Variation 1) PHOTO | || L, LL1, DF || CF, CIF, CI, C || D, LL3, LL2|| | || LL0, LL00, A || B, T&T, ST, S&S || D, Th, Sh2, Sh1|| |

DIETZGEN (USA) Vector Type Log Log No. 1735 Maniphase Multiplex (Variation 2) | || LL02, LL03, DF || CF, CIF, CI, C || D, LL3, LL2|| | || L, LL01, LL1, A || B, T& T, ST, S& S || D, Th, Sh2, Sh1|| |

DIETZGEN (USA) Vector Type Log Log No. 1735 Maniphase Multiplex | || LL02, LL03, DF || CF, CIF, CI, C || D, LL3, LL2|| | || Sh1, Sh2, Th, A || B, T& T, ST, S& S || D, DI, LL01, LL1|| |

DIETZGEN (USA) Vector Type Log Log No. N1725 Maniphase Multiplex | || LL01, LL02, LL03, DF || CF, CIF, L, CI, C || D, LL3, LL2, LL1|| | || Th, K, A || B, T<45°&T<45°, T>45°&T>45°, ST, S&S || D, DI, Sh2, Sh1 || |

DIETZGEN (USA) Vector Type Log Log No. N1725 | ||

DIETZGEN (USA) Vector Type Log Log No. N1725 Micromatic (Variation 1) | || LL01, LL02, LL03, DF || CF, CIF, L, CI, C || D, LL3, LL2, LL1|| | || Th, K, A || B, T1, T2, ST, S || D, DI, Sh2, Sh1|| |

DIETZGEN (USA) Vector Type Log Log No. N1725 Micromatic (Variation 2) | || LL01, LL02, LL03, DF || CF, CIF, L, CI, C || D, LL3, LL2, LL1|| | || Th, K, A || B, T1, T2, ST, S || D, DI, K|| |

DIETZGEN (USA) Vector Type Log Log No. 1725N Micromatic (Variation 3) | || LL01, LL02, LL03, DF || CF, CIF, L, CI, C || D, LL3, LL2, LL1|| | || Th, K, A || B, T1, T2, ST, S || D, DI, K|| |

DIETZGEN (USA) Vector Type Log Log No. N1725 Microglide | || LL01, LL02, LL03, DF || CF, CIF, L, CI, C || D, LL3, LL2, LL1|| | || Th, K, A || B, T1, T2, ST, S || D, DI, K|| |

DIETZGEN (USA) Vector Type Log Log No. B-1725 (Made in Japan) PHOTO | || Th, Sh2, Sh1, A || B, T<45°&T<45°, T>45°&T>45°, ST, S&S || D, DI, K|| | || LL01, LL02, LL03, DF || CF, CIF, L, CI, C || D, LL3, LL2, LL1|| |

DIETZGEN (USA) Vector Type Log Log No. B-1725? (Made in USA) PHOTO | || Th, Sh2, Sh1, A || B, T<45°&T<45°, T>45°&T>45°, ST, S&S || D, DI, K|| | || LL01, LL02, LL03, DF || CF, CIF, L, CI, C || D, LL3, LL2, LL1|| |

DING FENG (China) Slide Rule has no ID No. or name on it; Box has No. 5471 PHOTO | || 2D, L, K, A || Tan&Cot, Sin&Cos, H', CI, C || D, Th, Sh1, Sh2 || CF and DF are folded at √10 | || LL1I, LL2I, LL3I, DF || CF, CIF, H, CI, C || D, LL3, LL2, LL1|| |

DING FENG (China) No. 5471 PHOTO | || 2D, L, K, A || Tan&Cot, Sin&Cos, H', CI, C || D, Th, Sh1, Sh2 || | || LL1I, LL2I, LL3I, DF || CF, CIF , H, CI, C || D, LL3, LL2, LL1|| CF and DF are folded at π |

DING FENG (China) No. 5571 | || 2D, L, K, A || Tan&Cot, Sin&Cos, H', CI, C || D, Th, Sh1, Sh2 || CF and DF are folded at √10 | || LL1I, LL2I, LL3I, DF || CF, CIF , H, CI, C || D, LL3, LL2, LL1|| |

DING FENG (China) No. 5651 PHOTO | || 2D, L, K, A || Sin&Cos,Tan&Cot, CI, C || D, Th, Sh2, Sh1 || CF and DF are folded at √10 | || LL1I, LL2I, LL3I, DF || CF, CIF , H, CI, C || D, LL3, LL2, LL1|| |

DING FENG (China) No. 5652 PHOTO | || Th, K, A || B Sin&Cos,Tan&Cot C || D, Sh2, Sh1 || | || LL1, L, DF || CF, CIF, CI, C || D, LL3, LL2|| CF and DF are folded at √10 |

DING FENG (China) No. 5810 | || LL1I, LL2I, LL3I, DF || CF, CIF, H, CI, C || D, LL3, LL2, LL1||CF and DF are folded at √10 | || Th, L, K, A || B, S&S, H', T&T, C || D, DI, Sh2, Sh1 || |

DING FENG (China) PHOTO No. 5851 | || Th, L, K, A || B, S, H', T, C || D, DI, Sh2, Sh1 || | || LL1I, LL2I, LL3I, DF || CF, CIF, H, CI, C || D, LL3, LL2, LL1|| |

DING FENG (China) PHOTO No. 5852 | || Th, L, K, A || B, S, H', T, C || D, DI, H, Sh2, Sh1 | || LL1I, LL2I, LL3I, DF || CF, CIF, H, CI, C || D, LL3, LL2, LL1 || |

ECKEL (The Eckel Co., USA) Engineer's Log Log (Circular Slide Rule) PHOTO | || LL1, LL2, LL3, LL4, C || D, DI, A, K, L || Scales are printed on cursor | || SH1, SH2, TH, D, ST, S, T < 45°, T > 45° || Scales are printed on cursor |

FABER-CASTELL (Germany) Mathema No. 2/84 PHOTO | Left Front: (e^{Xg}),tan x^{g},sqrt(X^{2}-1),sqrt X, || sqrt X, (1 / sqrt X), 1/y, y || Y, sqrt( 1 - X^{2}), sin X^{g}, (e^{X}) || Right Front: || ^{g}ln Y, ^{g}tanY, sqrt(1 + Y^{2}), Y^{2} || y^{2}, 1/y^{2}, 1/y, y || Y, sqrt(1 - Y^{2}), ^{g}sinY, (lnY) || | Left Back: || -0.1 lnX, -lnX, -10 ln X || tanh x^{g}, 0.1 cosh x^{g}, 0.1 sinh x^{g}, sinh x^{g} || 10 ln X, lnX, 0.1 lnX || Right Back: || e ^{-10Y}, e^{-Y}, e^{-0.1Y} || ^{g}tanh y, ^{g}cosh 10y, ^{g}sinh 10y, ^{g}sinh y || e^{0.1Y} , e^{Y}, e^{10Y} || |

FABER-CASTELL (Germany) Mathema No. 2/84N PHOTO | Left Front: (e^{Xg}),tan x^{g},sqrt(X^{2}-1),sqrt X, || sqrt X, (1 / sqrt X), 1/y, y || Y, sqrt( 1 - X^{2}), sin X^{g}, (e^{X}) || Right Front: || ^{g}ln Y, ^{g}tanY, sqrt(1 + Y^{2}), Y^{2} || y^{2}, 1/y^{2}, 1/y, y || Y, sqrt(1 - Y^{2}), ^{g}sinY, (lnY) || | Left Back: || 10 ln X, ln X, 0.1 ln X, Y || y, 0.1 cosh x^{g}, 0.1 sinh x^{g}, sinh x^{g} || tanh x^{g}, -0.1 ln X, -ln X, -10 ln X || Right Back:|| e ^{0.1Y}, e^{Y}, e^{10Y} , Y || y, ^{g}cosh 10y, ^{g}sinh 10y, ^{g}sinh y || ^{g}tanh y, e^{-10Y} , e^{-Y}, e^{-0,1Y} || |

FABER-CASTELL (Germany) 989 Complex Hyperbolic Function Calculator | ||

FLYING FISH (China) No. 1002 PHOTO | || Ln1I, Ln2I, Ln3I, DF || CF, CIF, H2, H3, CI, C || D, Ln3, Ln2, Ln1|| CF is folded at √ 10 | || sh2, sh3, K, A || B, sin2cos2, H'2, tg2ctg2, tg3ctg3, C || D, DI, lg, th2 || |

FLYING FISH (China) No. 1003 PHOTO | || lnI_{-2}, lnI_{-1}, lnI_{0}, lnI_{1}, DF || CF, CIF, H0, H1, H'0, CI, C || D, ln_{1}, ln_{0}, ln_{-1}, ln_{-2} || CF is folded at √ 10 | || sh_{}o, sh_{1}, cu_{1}, cu_{2}, cu_{3} || lq_{1}^{-1}, tg_{o}ctg_{o}, tg_{1}ctg_{1}, tg_{2}ctg_{2}, sin_{o}cos_{o}, srt_{-1}cos_{-1}ctg_{-1}, C || D, sqi_{2}, sq_{1}, th_{o}, ch_{1} || |

FLYING FISH (China) No. 1004 PHOTO | || Th, Ch, K, A || B, T&T, ST&ST, S&S, C || D, DI, Sh2, Sh1 || CF and DF are folded at π | || LL01, LL02, LL03, DF || CF, CIF, L, CI, C || D, LL3, LL2, LL1|| |

FLYING FISH (China) No. 1009 PHOTO | || Sh1, Sh2, K, A || B, T&T, ST, S&S, C || D, DI, P, Th || | || LL01, LL02, LL03, DF || CF, CIF, L, CI, C || D, LL3, LL2, LL1|| CF is folded at √ 10 |

FLYING FISH (China) No. 1012 PHOTO | || sh_{0}X, sh_{1}X, (^{3}√X)_{1}, (√X)_{2} || (√X)_{1} , √(1-X^{2})_{-1} , s_{-1} t_{-1} t_{-1} cos_{-1} ctg_{-1}, tg_{o}X ctg_{o}X, (√1-X^{2})_{o} , sin_{o}X cos_{o}X , Y_{2} || Y1, Y_{2}I , ch1X , th_{o}X , (e^{x})_{1} || | || ln_{-2}X , ln_{-1}X, ln_{o}X , ln_{1}X , Y_{2}F || Y_{1}F , Y_{1}FI , (10^{x})_{1} , (√ X^{2}-1_{)1} , (√ X^{2}-1_{)o} , Y_{1}I , Y_{2} || Y_{1} , ln_{1}X , ln_{o}X , ln_{-1}X , ln_{-2}X || |

Shanghai (China) No. 1015-1 PHOTO | || Sh1, Sh2, K, A || B, T&T, ST, S&S, C || D, DI, L, Th || CF is folded at √ 10 | || LL/1, LL/2, LL/3, DF || CF, CIF, H, CI, C || D, LL3, LL2, LL1|| |

Flying Fish (China) No. 1015-1 PHOTO | || Sh1, Sh2, K, A || B, T&T, ST, S&S, C || D, DI, L, Th || CF is folded at √ 10 | || LL/1, LL/2, LL/3, DF || CF, CIF, H, CI, C || D, LL3, LL2, LL1|| |

Flying Fish (China) No. 1015 PHOTO | || Sh1, Sh2, K, A || B, T&T, ST, S&S, C || D, DI, L, Th || CF is folded at √ 10 | || LL/1, LL/2, LL/3, DF || CF, CIF, H, CI, C || D, LL3, LL2, LL1|| |

FLYING FISH (China) No. 1018 Electricians slide rule ( See Shanghai China No. 1018) PHOTO | || Θ^{°}, RΘ, P', P || Q, QI, L, I || J, J', T, GΘ || This has Gudermannian scales., and is not folded. | || lnI_{-1}, lnI_{0}, lnI_{1}, K_{1}, A_{1} || B_{1}, tg_{o}ctg_{o},sin_{o}cos_{o}, C || D, DI, ln, ln_{0}, ln_{-1} || |

FLYING FISH (China) No. 1200 PHOTO | || ln_{I-1}, lnI_{0}, lnI_{1}, DF || CF, CIF, sin_{o}cos_{o}, H'_{0}, CI, C || D, ln_{1}, ln_{0}, ln_{-1} || CF is folded at √ 10 | || sh_{o}, sh_{1}, K, A || B, srt_{-1}cos_{-1}ctg_{-1}, tg_{o}ctg_{o}, tg_{1}ctg_{1}, tg_{2}ctg_{2}, C || D, lg_{-1}, th_{o}, ch_{1} || |

FLYING FISH (China) No. 6006 Electrical Engineering Slide Rule | || db, Neper, Volt, Dynamo, A || B, T&T, S&S, C || D, K, P, L || CF is folded at π | || Sh1, Sh2, Th, Ch, DF || CF, CIF, CI, C || D, LL3, LL2, LL1 || |

FLYING FISH (China) No. 6201 | || L, K, A || B, T&T, ST, S&S || D, Sh2, Sh1, Th || CF and DF are folded at π | || LLo1, LLo2, LLo3, DF || CF, CIF, CI, C || D, LL3, LL2, LL1|| |

Gong Si He Ying (China) | || LL02, LL03, DF || CF, CIF, CI, C || D, LL3, LL2|| CF is folded at π | || Sh1, Sh2, Th, A || B, T&T, SRT, S&S || D, DI, LL01, LL1 || |

GRAPHOPLEX (France) Neperlog Hyperbolic No. 691 PHOTO | || L, P, Ch, A || B, T<45° & T<45°, ST & ST, S & S, C || D, Th, Sh2, Sh1 || | || LL01, LL02, LL03, DF || CF, CIF, CI, C || D, LL3, LL2, LL1 || |

GRAPHOPLEX (France) Neperlog Hyperbolic No. 691a PHOTO | || L, P, Ch, A || B, T<45° & T<45°, ST & ST, S & S, C || D, Th, Sh2, Sh1 || | || LL01, LL02, LL03, DF || CF, CIF, K, CI, C || D, LL3, LL2, LL1 || |

HAIOU PAI (China) No. 6531 PHOTO | || LL01, LL02, LL03, DF || CF, CIF, L, CI, C || D, LL3, LL2, LL1|| CF is folded at π | || Th, K, A || B, T&T, ST, S&S, C || D, DI, Sh2, Sh1 || |

HAIOU PAI (China) No. 6631 | ||

HAIOU PAI (China) No. 6681 Haiou (Seagull) | || LL01, LL02, LL03, DF || CF, CIF, H, CI, C || D, LL3, LL2, LL1|| CF is folded at π | || L, Sh1, Sh2, A || B, T&T, ST, S&S, C || D, P, Th, Ch || |

HANGZHOU JIANG SHI YI XING (China) No Number | ||

HEMMI (Japan) Duplex Slide Rule No. 153 (For Electrical Engineer) PHOTO | || L, K, A || B, CI, C || D, T, G_{Θ} || Note: This is the first slide rule sold with Gudermannian hyperbolic scales. | || Θ, R _{Θ}, P || Q, Q', C || LL3, LL2, LL1 || |

HEMMI (Japan) Duplex Slide Rule No. 154 (For Advanced Electrical Engineer) PHOTO | || DF, P' , P || Q, CF, CI, S_{Θ}^{0} || A, D, K || | || S_{x}, T_{x}, T_{Θ}^{0}, T_{Θ}^{0} || Th, Sh, Sh, C || D, L, Χ || |

HEMMI (Japan) Duplex Slide Rule No. 155 (For Advanced Electrical Engineer) PHOTO | || K, A, DF || CF, B, CI, C || D, L || is folded at √10 | ||Sh1, Sh2, Th1 || TI1&TI1, TI2&TI2, SI1&SI1, C || D, DI || |

HEMMI (Japan) Duplex Slide Rule No. 255 (For Expert Electrical Engineer) Version 1 PHOTO | || L, K, DF || CF, CIF, CI, C || D, X , Θ || NOTE: X is radians and Θ is degrees. | ||Sh1, Sh2, Th, A || B, TI2, TI1, SI, C || D, LL3, LL2, LL1 || |

HEMMI (Japan) Duplex Slide Rule No. 255 (For Expert Electrical Engineer) Version 2 PHOTO | || L, K, DF || CF, CIF, CI, C || D, LL3, LL2, LL1 || | ||Sh1, Sh2, Th, A || B, TI2, TI1, SI, C || D, X, Θ|| NOTE: X is radians and Θ is degrees. |

HEMMI (Japan) Duplex Slide Rule No. 255D (For Expert Electrical Engineer) PHOTO | || L, K, DF || CF, CIF, CI, C || D, LL3, LL2, LL1 || | ||Sh1, Sh2, Th, A || B, TI2&TI2, TI1&TI1, SI&SI, C || D, DI, X, Θ || X is radians; Θ degrees. |

HEMMI (Japan) Duplex Slide Rule No. 266 ("ELECTRONICS") | || LL03, LL02, LL2, A || B, BI, Sh1, Sh2, Th, CI, C || D, DI, P, L || | ||XL, X_{c}, F, r1 || r2, ST, S&S, T&T, L || Cf/C, C_{z}, L, Z, Fo || Some of these Back Scales are multiple scales. |

HEMMI (Japan) Duplex Slide Rule No. 266 ("ELECTRONICS") PHOTO | || LL3, LL1, LL2, LL2, A || B, BI, CI, C || D, dB/L , S&S, T&T|| | ||X_{L}, X_{c}, F, r1 || r2, L, Cf/C, C_{z} || L, Z, f_{o} || Some of these Back Scales are multiple scales. |

HEMMI (Japan) Duplex Slide Rule No. 275 (For Advanced Electrical Engineer) Version 1 PHOTO | || L, K, DF || CF, CIF, CI, C || D, X , Θ || NOTE: X is radians and Θ is degrees. | ||Sh1, Sh2, Th, A || B, TI2, TI1, SI, C || D, LL3, LL2, LL1 || |

HEMMI (Japan) Duplex Slide Rule No. 275 (For Advanced Electrical Engineer) Version 2 | || L, K, DF || CF, CIF, CI, C || D, LL3, LL2, LL1 || | ||Sh1, Sh2, Th, A || B, TI2, TI1, SI, C || D, X , Θ || X is radians; Θ degrees. |

HEMMI (Japan) Duplex Slide Rule No. 275D (For Advanced Electrical Engineer) PHOTO | || L, K, DF || CF, CIF, CI, C || D, LL3, LL2, LL1 || | ||Sh1, Sh2, Th, A || B, TI2&TI2, TI1&TI1, SI&SI, C || D, DI, X, Θ || X is radians; Θ degrees. |

I-J Slide Rule (China) No Number | ||

I-J Slide Rule (China) | ||

JIANG (China) No. 6171 PAT 129 Jiangshi Type B. Designed by Jiang Dequ 1940 PHOTO | ||LL1, CU, (T)&(T) || B,S&S,SH,CI,C || D, LL2, LL3 | ||LL1, L, CT || B, CS, TH, C || D, LL2, LL3 || |

KEUFFEL & ESSER (USA) Log Log Vector No. 4093-3 PHOTO | || L, LL0, DF || CF, B, CI, C || D, LL3, LL2|| Note: This is the first slide rule sold with hyperbolic scales. | || Sh1, Sh2, Th || SI1&SI1, SI2&SI2, TI&TI || D, S, T || See C.M. - K&E Catalogs site |

KEUFFEL & ESSER (USA) Log Log Vector No. 4093-5 PHOTO | || L, LL0, DF || CF, B, CI, C || D, LL3, LL2|| | || Sh1, Sh2, Th || SI1&SI1, SI2&SI2, TI&TI || D, S, T || See C.M. - K&E Catalogs site |

KEUFFEL & ESSER (USA) Log Log Duplex Vector No. 4083-3 PHOTO | || L, LL1, DF || CF, CIF, CI, C || D, LL3, LL2|| | || LL0, LL00, A || B, T&T, ST, S&S || D, Th, Sh2, Sh1|| See C.M. - K&E Catalogs site. |

KEUFFEL & ESSER (USA) Log Log Duplex Vector No. 4083-3 | || LL02, LL03, DF || CF, CIF, CI, C || D, LL3, LL2|| | || L, LL01, LL1, A || B, T&T, ST, S&S || D, Th, Sh2, Sh1|| See C.M. - K&E Catalogs site |

KEUFFEL & ESSER (USA) Log Log Duplex Vector No. 4083-3S PHOTO | || LL02, LL03, DF || CF, CIF, CI, C || D, LL3, LL2|| | || L, LL01, LL1, A || B, T&T, ST, S&S || D, Th, Sh2, Sh1|| See C.M. - K&E Catalogs site |

KEUFFEL & ESSER (USA) Log Log Duplex Vector No. 4083-3 | || LL02, LL03, DF || CF, CIF, CI, C || D, LL3, LL2|| | || Sh1, Sh2, Th, A || B, T&T, ST, S&S || D, DI, LL01, LL1 || See C.M. - K&E Catalogs site |

KEUFFEL & ESSER (USA) Log Log Duplex Vector No. 4083-3 PHOTO | || LL02, LL03, DF || CF, CIF, CI, C || D, LL3, LL2|| | || Sh1, Sh2, Th, A || B, T&T, ST, S&S || D, DI, LL01, LL1 || See C.M. - K&E Catalogs site |

KEUFFEL & ESSER (USA) Log Log Duplex Vector No. 4083-3 PHOTO | || LL02, LL03, DF || CF, CIF, CI, C || D, LL3, LL2|| | || Sh1, Sh2, Th, A || B, T&T, SRT, S&S || D, DI, LL01, LL1 || See C.M. - K&E Catalogs site |

KEUFFEL & ESSER (USA) Log Log Duplex Vector No. 68 1434 & 68 1439 (4083-3) | || LL02, LL03, DF || CF, CIF, CI, C || D, LL3, LL2|| | || Sh1, Sh2, Th, A || B, T&T, ST, S&S || D, DI, LL01, LL1 || See C.M. - K&E Catalogs site |

KEUFFEL & ESSER (USA) Log Log Duplex Vector No. 4083-5 | || L, LL1, DF || CF, CIF, CI, C || D, LL3, LL2|| | || LL0, LL00, A || B, T&T, ST, S&S || D, Th, Sh2, Sh1|| See C.M. - K&E Catalogs site |

KEUFFEL & ESSER (USA) Log Log Duplex Vector No. 4083-5 | || LL02, LL03, DF || CF, CIF, CI, C || D, LL3, LL2|| | || L, LL01, LL1, A || B, T&T, ST, S&S || D, Th, Sh2, Sh1|| See C.M. - K&E Catalogs site |

KEUFFEL & ESSER (USA) Log Log Duplex Vector No. N4083-5 | || LL02, LL03, DF || CF, CIF, CI, C || D, LL3, LL2|| | || L, LL01, LL1, A || B, T&T, ST, S&S || D, Th, Sh2, Sh1|| See C.M. - K&E Catalogs site |

KEUFFEL & ESSER (USA) Log Log Duplex Vector No. N4083-5 | || LL02, LL03, DF || CF, CIF, CI, C || D, LL3, LL2|| | || Sh1, Sh2, Th, A || B, T&T, ST, S&S || D, DI, LL01, LL1 || See C.M. - K&E Catalogs site |

KEUFFEL & ESSER (USA) Log Log Duplex Vector No. 4083-5 | || LL02, LL03, DF || CF, CIF, CI, C || D, LL3, LL2|| | || Sh1, Sh2, Th, A || B, T&T, ST, S&S || D, DI, LL01, LL1 || See C.M. - K&E Catalogs site |

KEUFFEL & ESSER (USA) Log Log Duplex Vector No. 4083-5 | || LL02, LL03, DF || CF, CIF, CI, C || D, LL3, LL2|| | || Sh1, Sh2, Th, A || B, T&T, ST, S&S || D, DI, LL01, LL1 || See C.M. - K&E Catalogs site |

KEUFFEL & ESSER (USA) Log Log Duplex Vector No. 68 1424 & 68 1429 (4083-5) | || LL02, LL03, DF || CF, CIF, CI, C || D, LL3, LL2|| | || Sh1, Sh2, Th, A || B, T&T, ST, S&S || D, DI, LL01, LL1 || See C.M. - K&E Catalogs site |

KEUFFEL & ESSER (USA) Log Log Duplex Vector No. 68 1434 PHOTO | || LL02, LL03, DF || CF, CIF, CI, C || D, LL3, LL2|| | || Sh1, Sh2, Th, A || B, T&T, SRT, S&S || D, DI, LL01, LL1 || See C.M. - K&E Catalogs site |

KEUFFEL & ESSER (USA) KeLon (This 10 in. Rule was designed, but not produced) | || Ln-3, Ln-2, Ln-1, Ln-0, DF || CF, CIF, L, CI, C || D, Ln0, Ln1, Ln2, Ln3 | || Constants, Sh1, Sh2, Th, A || B, T1&T1, SRT, SI2&SI2, C || D, DI, K, Sq1, Sq2 || |

LAFAYETTE (USA / JAPAN San - AI Group) VECTORLOG No. F - 686 PHOTO | || Tr1, Tr2, P', P || Q, ST, Sr, S°, C || D, LLo3 LLo2, Llo1 || Note: LL1' is at end of C; Sr is radians; S° is in degrees. | || Sh1, Sh2, DF, A || B, CF, Th, CI, C || D, LL3, LL2, db || Note: db is 20 lg x |

LAFAYETTE (USA / JAPAN San - AI Group) VECTORLOG No. 99-7102 PHOTO | || Tr1, Tr2, P', P || Q, ST, Sr, S°, C || D, LLo3 LLo2, Llo1 || Note: LL1' is at end of C; Sr is radians; S° is in degrees. | || Sh1, Sh2, DF, A || B, CF, Th, CI, C || D, LL3, LL2, db || Note: db is 20 lg x |

LAFAYETTE (USA / JAPAN San - AI Group) VECTORLOG No. 99-71029 PHOTO | || Tr1, Tr2, P', P || Q, ST, Sr, S°, C || D, LLo3 LLo2, Llo1 || Note: LL1' is at end of C; Sr is radians; S° is in degrees. | || Sh1, Sh2, DF, A || B, CF, Th, CI, C || D, LL3, LL2, db || Note: db is 20 lg x |

LUTZ ( JAPAN / USA) No. 300 B PHOTO | || Sh1, Sh2, Th, A || B, T&T, ST&ST, S&S, C || D, DI, P, K || | || LL1, LL2, LL3, DF || CF, CIF, L, CI, C || D, LL3, LL2, LL1|| |

MICRONTA (JAPAN) No. 157 PHOTO | || Sr, S°, P', P || Q, CF, CI, C || D, DF, LL2, LL3 || Note: LL1' is at end of C; Sr is radians; S° is in degrees. | || Sh2, Sh1, A || B, K, Th, C || D, Tr1, Tr2, db || Note: db is 20 lg x |

MICRONTA ( JAPAN San - AI Group) No. 1157 Electric Vector | || Sr, S° & S°, P', P || Q, CF, CI, C || D, DF, LL2, LL3 || Note: LL1' is at end of C; Sr is in radians; S° is in deg. | || Sh2, Sh1, A || B, K, Th, C || D, Tr1, Tr2, db || Note: db is 20 lg x |

NIKKEI (JAPAN Nippon Slide Rule Co.) NIKKEI 520 Duplex | || L, K, DF || CF, CIF, CI, C || D, X, Θ || Note: X is radians; Θ degrees | || Sh1, Sh2, Th, A || B, T, S, ST, C || D, LL1, LL2, LL3 || |

Paper Slide Rule (CHINA) No Number and unknown Name | || L, LL1, DF || CF, CIF, CI, C || D, LL3, LL2|| Very crudely made - scales are all black color. CF folded at π | || LL0, LL00, A || B, T, ST, S || D, Th, Sh2, Sh1|| Similar to K&E 4083-3 (1939-1946) See 54 |

PATRICK Corp/ (USA) MARK IV data log PHOTO | || K, odd √ , even √ , A || B, T & T, ST, S & S, C || D, DI, Th, Sh2, Sh1|| | ||LL0 +, LL0 -, LL1 +, LL1 -, DF || CF, CIF, L, CI, C || D, LL2 +, LL2 -, LL3 +, LL3 - || |

PICKETT & ECKEL (USA) 4 Deci - Log Log Vector Hyperbolic PHOTO | || 1/N_{1}, 1/N_{2}, 1/N_{3}, 1/N_{4}, DF || CF, Th, Sh, Sh, CI, C || C_{0} & D, N_{1}, N_{2}, N_{3}, N_{4} || | ||Three cube root scales ^{3} √, DF|| CF, T&T, ST, S&S, CI, C || D, DI, Two sqrt scales √ || |

PICKETT & ECKEL (USA) 4 Deci - Log Log Vector Hyperbolic PHOTO | || N_{1},1/N_{1}, N_{2}, 1/N_{2}, DF/M || CF/M, Th, Sh, Sh, CI, C || D, N_{3}, 1/N_{3}, N_{4}, 1/N_{4} || | ||Three cube root scales ^{3} √, DF|| CF, T&T, ST, S&S, CI, C || D, DI, Two sqrt scales √ || |

PICKETT & ECKEL (USA) No. 4 Vector Hyperbolic Log Log | ||Three cube root scales ^{3} √, DF|| CF, T&T, ST, S&S, CI, C || D, DI, Two sqrt scales √ || | || 1/N_{1}, 1/N_{2}, 1/N_{3}, 1/N_{4}, DF/M || CF/M, Th, Sh, Sh, CI, C || C_{0} & D, N_{1}, N_{2}, N_{3}, N_{4} || |

PICKETT & ECKEL (USA) 4-T Dual-Base Log Log (Vector Hyperbolic) PHOTO | ||Three cube root scales ^{3}√, DF|| CF, T&T, ST, S&S, CI, C || D, DI, Two sqrt scales √ || | || LL_{1}&LL_{1}, LL_{2}&LL_{2}, DF/M || CF/M, Th, Sh&Sh, L, CI, C || D, LL_{3}&LL_{3}, LL_{4}&LL_{4} || |

PICKETT & ECKEL (USA) 4-T Dual-Base Log Log Reciprocal Scale (Vector Hyperbolic) PHOTO | ||Three cube root scales ^{3}√, DF|| CF, T&T, ST, S&S, CI, C || D, DI, Two sqrt scales √ || | || LL_{1}&LL_{1}, LL_{2}&LL_{2}, DF || CF, Th, Sh&Sh, L, CI, C || D, LL_{3}&LL_{3}, LL_{4}&LL_{4} || |

PICKETT & ECKEL (USA) 4-T Dual-Base Log Log (Vector Hyperbolic) SYNCHRO SCALE PHOTO | ||Three cube root scales ^{3}√, DF|| CF, T&T, ST, S&S, CI, C || D, DI, Two sqrt scales √ || | || LL_{1}&LL_{1}, LL_{2}&LL_{2}, DF || CF, Th, Sh&Sh, L, CI, C || D, LL_{3}&LL_{3}, LL_{4}&LL_{4} || |

PICKETT & ECKEL (USA) 4-T LOG LOG Vector Hyperbolic Dual-Base SPEED RULE | ||Three cube root scales ^{3}√, DF|| CF, T&T, ST, S&S, CI, C || D, DI, Two sqrt scales √ || | || LL_{1}&LL_{1}, LL_{2}&LL_{2}, DF || CF, Th, Sh&Sh, L, CI, C || D, LL_{3}&LL_{3}, LL_{4}&LL_{4} || |

PICKETT & ECKEL (USA) N4-T Vector - Type LOG LOG Dual - Base Speed Rule PHOTO | ||Three cube root scales _{3}√ , DF || CF, CIF, T&T, ST, S&S, CI, C || D, DI, Two sqrt scales √ || | || LL_{1}&LL_{1}, LL_{2}&LL_{2}, DF/M || CF/M, Th, Sh&Sh, Ln, L, CI, C || D, LL_{3}&LL_{3}, LL_{4}&LL_{4} || |

PICKETT & ECKEL (USA) N4-ES Vector - Type LOG LOG Dual - Base Speed Rule PHOTO | ||Three cube root scales _{3}√ , DF || CF, CIF, T&T, ST, S&S, CI, C || D, DI, Two sqrt scales √ || | || LL_{1}&LL_{1}, LL_{2}&LL_{2}, DF/M || CF/M, Th, Sh&Sh, Ln, L, CI, C || D, LL_{3}&LL_{3}, LL_{4}&LL_{4} || |

PICKETT & ECKEL (USA) N4-T Vector - Type LOG LOG Dual - Base Speed Rule | ||Three cube root scales _{3}√ , DF || CF, CIF, T&T, ST, S&S, CI, C || D, DI, Two sqrt scales √ || | || LL_{1}&LL_{1}, LL_{2}&LL_{2}, DF/M || CF/M, Th, Sh&Sh, Ln, L, CI, C || D, LL_{3}&LL_{3}, LL_{4}&LL_{4} || |

PICKETT & ECKEL (USA) N4p-T Vector - Type LOG LOG Dual - Base Speed Rule PHOTO | ||Three cube root scales _{3}√ , DF || CF, CIF, T&T, ST, S&S, CI, C || D, DI, Two sqrt scales √ || | || LL_{1}&LL_{1}, LL_{2}&LL_{2}, DF/M || CF/M, Th, Sh&Sh, Ln, L, CI, C || D, LL_{3}&LL_{3}, LL_{4}&LL_{4} || |

PICKETT & ECKEL (USA) 8 - T McGann Variable Density Flow Computer (Magnesium Model) | || P_{t}/P, T_{t}/T, λ, M, J4, J3 || λ4, λ3, λ2, λ1, λ0 || J2, J0-1&M, λ, T_{t}/T, P_{t}/P || | || LL1&LL1, LL2&LL2, DF/M || CF/M, Th, Sh&Sh, Ln, L, CI, C || D, LL3&LL3, LL4&LL4 || |

PICKETT & ECKEL (USA) 8 - T McGann Variable Density Flow Computer (Magnesium Model) PHOTO | || P_{t}/P, T_{t}/T, λ, M, J4, J3 || λ4, λ3, λ2, λ1, λ0 || J2, J0-1&M, λ, T_{t}/T, P_{t}/P || | || LL1&LL1, LL2&LL2, DF/M || CF/M, Th, Sh&Sh, Ln, L, CI, C || D, LL3&LL3, LL4&LL4 || |

PICKETT & ECKEL (USA) N16-ES ELECTRONIC LOG LOG Dual - Base Speed RulePHOTO | || SH1, SH2, TH, DF || CF, L, S&S, ST, T&T, CI, C || D, LL3, LL2, LL1, Ln || | || θ & θ, db & db, D or Q, X_{L}, Z_{s} OR X_{c} || C or L, F, λ, ω, τ, τR' or X'c, Cr || Lr, db & db, COS Q & COS Q, t'C or C' || (NOTE: Both the tR' or X'c and the t'C or C' scales include numerous sub-scales for solving electronic calculations). |

PICKETT & ECKEL (USA) X-4 Vector - Type LOG LOG Dual - Base Speed Rule PHOTO | ||Three cube root scales _{3}√ , DF || CF, CIF, T&T, ST, S&S, CI, C || D, DI, Two sqrt scales √ || | || LL1&LL1, LL2&LL2, DF/M || CF/M, Th, Sh&Sh, Ln, L, CI, C || D, LL3&LL3, LL4&LL4 || |

POST (USA) Log Log Vector Model No. 1460 | ||

POST (USA) Log Log Vector Model No. 1461 PHOTO | || L, K, A || B, CI, C || D, T, G_{θ} || Note: has Gudermannian hyperbolic scales. | || θ, R_{θ} P || Q, Q', C || LL3, LL2, LL1 || |

PRECISION SCALE (USA) 1751 Log Log 10 Hyperbolic | || K, L, DIF, DF || CF, CIF, Two sqrt scales √ (odd & even), CI, C || D, DI, TH, SH1, SH2 || | || LL1, LL2, LL3, LL4, A || B, S&S, ST&ST, T&T, CI, C || D, LL/1, LL/2, LL/3, LL/4 || |

PRECISION SCALE (USA) 1752 Log Log e Hyperbolic | || Sh1, Sh2, Th, A || B, T&T, ST, S&S, CI, C || D, DI, K, L || | ||LL/0, LL/1, LL/2, LL/3, DF || CF, CIF, Two sqrt scales √ (odd & even), CI, C || D, LL3, LL2, LL1, LL0|| |

QUIFAN (CHINA) No Model No. | ||

REISS (East Germany) Duplex Model 3227 PHOTO | || LL00, LL01, LL02, LL03, DF || CF, CIF, BI, CI, C || D, LL3, LL2, LL1, LL0 || | || K, T_{1}, T_{2}, DI, A || Sh_{1}, Sh_{2}, Th, S_{Z} ,C || D, S_{K}, P, ST, L || |

RELAY (Japan San - Ai Group) No. 157 PHOTO | || Sr, Sθ, P', P || Q, CF, CI, C || D, DF, LL2, LL3 || Note: LL1' is at end of C; Sr is radians; Sθ is deg. | || Sh2, Sh1, A || B, K, Th, C || D, Tr1, Tr2, db ||r %Note: db is 20 lg x |

RELAY (Japan San - Ai Group) No. 158 PHOTO | || Sh_{2}, Sh_{1}, Th, A || BI, S, T, CI, C || D, DI, LL3, LL2, LL1 || | || X_{2}, X_{1}, P_{2}, P_{1} || Q, Y, L, _{L}X, I || I, L^{θ1} & L^{θ1},L^{θ2} & L^{θ2} , L^{Y} || |

RELAY (Japan San - Ai Group) No. 159 | ||

RELAY (Japan San - Ai Group) No. De 1008 | || Sh_{2}, Sh_{1}, Th, A || BI, S, T, CI, C || D, DI, LL_{3}, LL_{2}, LL_{1} || | || X_{2}, X_{1}, P_{2}, P_{1} || Q, Y, L, L^{X}, I || I, L^{θ1} & L^{θ1},L^{θ2} & L^{θ2} , L^{Y} || |

RELAY (Japan San - Ai Group) No. De 1008 PHOTO | || Sh_{2}, Sh_{1}, Th, A || BI, S, T, CI, C || D, DI, LL_{3}, LL_{2}, LL_{1} || | LL0, L, K, A || B, S, ST, T, C || D, DI, P, LL0 |

RICOH (Japan San - Ai Group) No. 157 | || Sr, Sθ, P', P || Q, CF, CI, C || D, DF, LL2, LL3 || Note: LL1' is at end of C; Sr is radians; Sθ is degrees. | || Sh2, Sh1, A || B, K, Th, C || D, Tr1, Tr2, db || Note: db is 20 lgx |

RICOH (Japan San - Ai Group) No. 158 | || Sh_{2}, Sh_{1}, Th, A || BI, S, T, CI, C || D, DI, LL_{3}, LL_{2}, LL_{1} || | || X_{2}, X_{1}, P_{2}, P_{1} || Q, Y, L, L^{X}, I || I, L^{θ1} & L^{θ1},L^{θ2} & L^{θ2} , L^{Y} || |

RICOH (Japan San - Ai Group) No. 159 | || LL_{-1}, LL_{-2}, LL_{-3}, A || B, BI, K, CI, C || D, LL_{3}, LL_{2}, LL_{1} || Note: A number of the scales are extended. | || Sh_{1}, Sh_{2}, P_{2}, P_{1} || Q, Sr, Sθ&Sθ, Th, C || D, T_{2}, T_{1}, L || Note: Sr is radians; Sθ is degrees |

RUYI (Chinese Shanghai) No. 1002 | || Ln1I, Ln2I, Ln3I, DF || CF, CIF, H2, H3, CI, C || D, Ln3, Ln2, Ln1|| CF is folded at √10 | || sh2, sh3, K, A || B, sin2cos2, H'2, tg2ctg2, tg3ctg3, C || D, DI, lg, th2 || |

RUYI (Chinese Shanghai) No. 1009 | ||

RUYI (Chinese Shanghai) No. 1015-1 PHOTO | || LL/1, LL/2, LL/3, DF || CF, CIF, H, CI, C || D, LL3, LL2, LL1|| CF is folded at √10 | || Sh1, Sh2, K, A || B, T&T, ST, S&S, C || D, DI, L, Th || |

RUYI(China) No. 1081 PHOTO | || sh_{0}, sh_{1}, K, A || B T_{1}, T_{2} SRT S C || D, DI, Th || | || ln_{-1} , ln_{0}, ln_{1} , || CF , CIF, H_{0}, H'_{0}, CI, C || D, ln_{1}, ln_{0}, ln_{-1} || |

RUYI (Chinese Shanghai) No. 1083 | || L, LL1, DF || CF, CIF, CI, C || D, LL3, LL2|| CF and DF are folded at π | || LL0, LL00, A || B, T&T, ST, S&S || D, Th, Sh2, Sh1|| Similar to K&E 4083-3 See 54 |

RUYI (Chinese Shanghai) No. 6201 | || L, K, A || B, T&T, ST, S&S, C || D, Sh2, Sh1, Th || | || LLo1, LLo2, LLo3, DF || CF, CIF, CI, C || D, LL3, LL2, LL1|| CF and DF are folded at π |

SCIENTIFIC INSTRUMENT COMPANY (SIC) (USA) Electro-Vector Log-Log No. 1570 | || Sr, Sθ & Sθ, P', P || Q, CF, CI, C || D, DF, LL_{2}, LL_{3} || Note: LL1' is at end of C; Sr is radians; Sθ is deg. | || Sh2, Sh1, A || B, K, Th, C || D, Tr1, Tr2, db || Note: db is 20 lgx |

SCIENTIFIC INSTRUMENT COMPANY (SIC) (USA) Electro Hyper-Vector Log-Log No. 1580 | || Sh_{2}, Sh_{1}, Th, A || BI, S&S, T&T, CI, C || D, LL_{3}, LL_{2}, LL_{1} || | || X_{2}, X_{1}, P_{2}, P_{1} || Q, Y, L, _{L}X, I || I, L^{θ1} & L^{θ1},L^{θ2} & L^{θ2} , _{L}Y || |

SHANGHAI (China) No. 1002 | ||

SHANGHAI (China) No. 1015-1 | ||

SHANGHAI (China Electricians Slide Rule No. 1018 | ||

SHANGHAI (China) I-J Function Slide Rule PHOTO | || ±G, ±Ii_{1}, I_{m}, 1/3X || 1/3X, ±J_{1}, J_{m} & J_{m}, C || D, LL3, LL2, LL1, L || | || Th, Ch, K, A || B, T&T, ST&ST, S&S, C || D, DI, Sh_{2}, Sh_{1} || (SHANGHAI is imprinted on Cursor) |

SHANGHAI (China) No. 5891 | ||

SIDA (China) No. 1 | || L, LL1, DF || CF, CIF, CI, C || D, LL3, LL2|| | || LL0, LL00, A || B, T&T, ST, S&S || D, Th, Sh2, Sh1|| |

SIDA (China) No. 1002 | || Ln1I, Ln2I, Ln3I, DF || CF, CIF, H1, H2, CI, C || D, Ln_{3}, Ln_{2}, Ln_{1}|| CF is folded at √10 | || sh1, sh2, K, A || B, sincos, H', tgctg, tgctg, C || D, DI, lg, th || |

SIDA (China) No. 1009 PHOTO | || Sh1, Sh2, K, A || B, T&T, ST, S&S, C || D, DI, P, Th || | || LL01, LL02, LL03, DF || CF, CIF, L, CI, C || D, LL3, LL2, LL1|| CF is folded at √ 10 |

SIDA (China) No. 1012 | ||

SIDA (China) No. 1015 | || LL/1, LL/2, LL/3, DF || CF, CIF, H, CI, C || D, LL3, LL2, LL1|| CF is folded at √10 | || Sh2, Sh1, K, A || B, T&T, ST, S&S, C || D, DI, L, Th || |

SIDA (China) No. 1015 | || LL/1, LL/2, LL/3, DF || CF, CIF, H, CI, C || D, LL3, LL2, LL1|| CF is folded at √10 | || Sh2, Sh1, K, A || B, T&T, ST, S&S, C || D, DI, L, Th || |

SIDA (China) No. 1083 PHOTO | || L, LL1, DF || CF, CIF, CI, C || D, LL3, LL2|| CF and DF are folded at π | || LL0, LL00, A || B, T&T, ST, S&S || D, Th, Sh2, Sh1|| |

SIDA (China) No. 5810 | || LL1I, LL2I, LL3I, DF || CF, CIF, H, CI, C || D, LL3, LL2, LL1|| CF and DF are folded at √10 | || Th, L, K, A || B, S&S, H', T&T, C || D, DI, Sh2, Sh1 || |

SIDA (China) No. 6171 | || Ln1I, Ln2I, Ln3I, DF || CF, CIF, H2, H3, CI, C || D, Ln3, Ln2, Ln1 || CF is folded at √10 | || sh2, sh3, K, A || B, sin2cos2, H'2, tg2ctg2, tg3ctg3, C || D, DI, lg, th2 || |

SIDA (China) No. 6201 PHOTO | || L, K, A || B, T&T, ST, S&S || D, Sh2, Sh1, Th || | || LLo1, LLo2, LLo3, DF || CF, CIF, CI, C || D, LL3, LL2, LL1|| CF and DF are folded at π |

TAMAYA (Japan) No. 4499 | ||

Thornton No. 146 Model B PHOTO | || sqrt1 sqrt2 D || C B CI Isd-Td-Vs-N M-W-Itd-Sd C || D E1 E2 \ RE1 RE2 | || sqrt1 sqrt2 G_{d} Isdh-Itdh Tdh-Sdh C|| |

Tianjin Jianzhong TJJX (Tianjin giant elephant) PHOTO | || LL02, LL03, DF || CF, CIF, CI, C || D, LL3, LL2|| | || Sh1, Sh2, Th, A || B, T&T, SRT, S&S || D, DI, LL01, LL1 || |

U. S. BLUEPRINT (USA/HEMMI) No. 1893 Duplex Slide Rule (For Electrical Engineer) | ||

XUESH (China) 6171 bachelor PHOTO | || Sh1, Sh2, K, A || B sin&cos, H1 tg1&ctg1, tg2&ctg2, C || D, DI, lg, th || | || lgln1I, lgln2I, lgln3I, DF || CF, CIF, H1, H2, CI, C || D, lgln3, lgln2, lgln1|| CF is folded at √10 |

XUESH (China) 6171 | || lgln1I, lgln2I, lgln3I, DF || CF, CIF, H1, H2, CI, C || D, lgln3, lgln2, lgln1|| CF is folded at √10 | || sh1, sh2, K, A || B, sin&cos, H1 tg1&ctg1, tg2&ctg2, C || D, DI, lg, th || |

XUESHI (China) 1572-K3 | || LL02, LL03, DF || CF, CIF, CI, C || D, LL3, LL2 || | || Sh1, Sh2, Th, A || B, T, SRT, S || D, DI, LL01, LL1|| |