Hyperbolic Match Output
Maker:KEUFFEL & ESSER (USA)
Model: Log Log Duplex Vector No. 68 1434 & 68 1439 (4083-3)
Scales Front: || LL02, LL03, DF || CF, CIF, CI, C || D, LL3, LL2||
Scales Back: || Sh1, Sh2, Th, A || B, T&T, ST, S&S || D, DI, LL01, LL1 || See C.M. - K&E Catalogs site
Gauge Marks: π is on A, B, CF, and DF; π/4 is on A and B scales; The marks 1°, ' and " are on scale ST.
Construction: 10 in.; Plastic face on wood ; Cursor is framed. Adjustable metal brackets with HEX screws.
Date: 1962 - 1972
Source: MOL and C.M. and WKR
Information: Identical rules with different color cases (See C.M. - K&E Catalogs site)