J. B. Carroll Co. Spring Design Slide Rule for Associated Spring Corporation
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", DT, "E", D ] d
Back: P or M [ s, D/d, D ] d
Condition: C5 (Normal signs of use)
Came with: Instruction sheet