Ricoh 1051S, Engineering Rule

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Country of manufacture: Japan,            Date of manufacture: 1969;       Date Code: RS-2
Overall length: 32.1 cm,          Width: 4.1 cm,           Weight: 118.3 gms
Materials: Celluloid Laminate over bamboo, metal end braces, adjustable
Cursor: 3.0 X 5.2 X 1.0 cms; plastic runners w/plastic lens, adjustable; lines = single line, front and back
Scales: 19, no extensions
Front: LL1, L, DF [ CF, CIF, CI, C ] D, LL3, LL2
Back: K, A [ B, S, T1, T2, C ] D, DI
Gauge Marks: [ π, C (1128), e, √10, ρ'' (2063), ρ' (3438), ρ^o (5730) ]
Condition: C5 (Normal signs of use)
Came with: orig. olive/white plastic case

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