Desk top calculator

Details Desk top calculator Desk top calculator

1978-10-13

1981-03-24

Zarfas, Louis S.

Printing and office machinery

Typewriter or calculator

Calculator

D1801

Patent

active

D02586649

REFERENCES:
patent: D226485 (1973-03-01), Kitai
patent: D227472 (1973-06-01), Hikawa
patent: D236132 (1975-07-01), Bellini
patent: D242721 (1976-12-01), Herr et al.

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