Circular slide rule

Details Circular slide rule Circular slide rule

1982-09-30

1985-01-08

Zarfas, Louis S.

Printing and office machinery

Typewriter or calculator

Calculator

D19 64

Patent

active

D02771080

REFERENCES:
patent: D267238 (1982-12-01), Schafer
patent: D269977 (1983-08-01), Gopfert
patent: 2719359 (1955-10-01), Webber
patent: 3486691 (1969-12-01), Rodriguez

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