Hyperbolic Match Output
Maker:DING FENG (China)
Model:No. 5471 Duplex Vector
Scales Front: || 2D, L, K, A || Tan&Cot, Sin&Cos, H', CI, C || D, Th, Sh1, Sh2 || CF and DF are folded at √10
Scales Back: || LL01, LL02, LL03, DF || CF, CIF, H, CI, C || D, LL3, LL2, LL1||
Gauge Marks: Need information. Probably the same as 22.
Construction: 25 cm.; Plastic face on laminated wood; Cursor is framed.
Source: PMH (Hopp Pg 161)and PVM and eBay and Xu Guisheng