Ricoh 1053-1, Engineering Rule

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Country of manufacture: Japan,            Date of manufacture: 1970       Date Code: SS-1
Overall length: 32.2 cm,          Width: 4.7 cm,           Weight: 124.9 gms
Materials: Celluloid Laminate over bamboo, metal end braces, adjustable
Cursor: 3.0 X 5.8 X 1.2 cms; plastic runners w/adjustable metal framed plastic lens, (probably not original); lines = single line, front and back.
Scales: 24
Front: LL3, LL2, LL1, DF [ CF, CIF, CI, C ] D, LL3, LL2, LL1
Back: LL0, LL0, K, A [ B, SI, TI1, TI2, C ] D, DI, L
Gauge Marks: [ π, C, e, 1/e, √10, ρ'', ρ', ρ^o, unknown V (62 on C scale on back of rule) ]
Condition: C4 (Minimal signs of use)
Came with: Orig. light blue/dark blue plastic case

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