Desk top electronic calculator

Details Desk top electronic calculator Desk top electronic calculator

1977-12-29

1980-06-03

Zarfas, Louis S.

Printing and office machinery

Typewriter or calculator

Calculator

D1801

Patent

active

D02552450

REFERENCES:
patent: D207281 (1967-03-01), Baughman
patent: D218785 (1970-09-01), Gore

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