Electronic calculating machine

Details Electronic calculating machine Electronic calculating machine

1979-01-08

1981-04-14

Zarfas, Louis S.

Printing and office machinery

Typewriter or calculator

Calculator

D1801

Patent

active

D02588927

REFERENCES:
patent: D243250 (1977-02-01), Hazama
patent: D252801 (1979-09-01), Usuda
patent: D254554 (1980-03-01), Genaro et al.
patent: 3940758 (1976-02-01), Margolin
patent: 4120039 (1978-10-01), Fischer

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