J. B. Carroll Co. Spring Design Slide Rule for Associated Spring Corporation

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Country of manufacture: USA,            Date of manufacture: c1952
Overall length: 29.2 cm,          Width: 4.8 cm,           Weight: 58.7 gms.
Materials: All plastic
Cursor: 3.8 X 5.5 X 0.7 cms; plastic; lines = single hairline, front & back
Scales: 12
Front: P/f or M/T [ N, "G", D_T, "E", D ] d
Back: P or M [ s, D/d, D ] d
Condition: C5 (Normal signs of use)
Came with: Instruction sheet

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