Desk-top electronic calculator

Details Desk-top electronic calculator Desk-top electronic calculator

1980-08-06

1982-11-09

Feifer, Melvin B.

Printing and office machinery

Typewriter or calculator

Calculator

D1801

Patent

active

D02668548

REFERENCES:
patent: D236353 (1975-08-01), Link
patent: D240736 (1976-07-01), Pemberton
patent: D243191 (1977-01-01), Pemberton
patent: D258894 (1981-04-01), Kitai

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