Metric converter slide rule

Details Metric converter slide rule Metric converter slide rule

1977-12-05

1979-10-09

Zarfas, Louis S.

Printing and office machinery

Typewriter or calculator

Calculator

D1999

Patent

active

D02531143

REFERENCES:
patent: 1728491 (1929-09-01), Janneson
patent: 2812905 (1957-11-01), Bachmann
patent: 3257075 (1966-06-01), Nayman
patent: 3643070 (1972-02-01), Dogigli

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