Ding Feng 5810 Hyperbolic

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Country of manufacture: China,            Date of manufacture: ____
Overall length: 34.0 cm,          Width: 4.7 cm,           Weight: 119.9 gms
Materials: celuloid laminate over bamboo, metal end plates
Cursor: 3.4 X 6.0 X 1.0 cms; plastic runners holding plastic lens, adjustable; lines = single hairline on both front and back
Scales: 26, no extensions
Front: Th, L, K, A [ B, Sin, √(1-X²), Tan, C ] D, DI, Sh2, Sh1
Back: e^-.01X, e^-.1X, e^-X, DF [ CF, CIF, H, CI, C ] D, LL3, LL2, LL1
Gauge Marks: [π, e, 1° (1745), R (5729) ]
Condition: C4-C5 (Minimal to Normal signs of use); some corrosion on metal end braces.
Came with: Origial black leather and cardboard case

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