Engineer's slide rule 15" D R Patent No. 173660 in black card case Mannheim-type scales on front

Engineer's slide rule 15" D R Patent No. 173660 in black card case Mannheim-type scales on front, engineers' constants on back

Details

Category:: Mathematics

Object Number:: 1974-268

type:: slide rule (engineering) and slide rule (mannheim)

credit:: Miss I. Rayner-Smith

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