Slide rules HOME page | COLLECTION | CIRCULAR RULES |
Make | Concise, Japan |
Model | No 28N |
Notes 1. This rule appears to have been given away by Time Life. It came
in a plastic pouch and with documentation both of which mention Time Life. |
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Front view |
Detail - front view |
Detail - back view |
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Manufacturing date | 1960+ |
Length | Circular |
Material | Plastic |
Scales | D, C, CI, A, K |
Gauge points | p: A,B: C: C,D |
Cursor | Plastic |
Hair lines | |
Documentation | Complete |
Condition | Very good, include plastic case |