Ricoh 159, hyperbolic/electronics type

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Country of manufacture: Japan,            Date of manufacture: 1969
Overall length: 35.4 cm,          Width: 4.7 cm,           Weight: 147.7 gms
Materials: Celluloid laminate over bamboo. metal end braces, adjustable
Cursor: 3.0 X 5.7 X 1.0 cms; all plastic adjustable; lines = single hairline, front and back
Scales: 26, Extensions on A, B, C, D
Front: LL-1, LL-2, LL-3, A [ B, BI, K, CI, C] D, LL3, LL2, LL1
Back: Sh₁, Sh₂, P₂, P₁ [Q, Sr, Sθ, Th, C] D, T₂, T₁ L
Gauge Marks: [ π, C, e, 1/e, ρ^o, f, 2π ]
Condition: C2 (Mint, no manual or box)
Came with: Original brown leather case

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