Desk top electronic calculator

Details Desk top electronic calculator Desk top electronic calculator

1978-02-24

1980-06-03

Zarfas, Louis S.

Printing and office machinery

Typewriter or calculator

Calculator

D1801

Patent

active

D02552469

REFERENCES:
patent: D218994 (1970-10-01), Suganoya
patent: D233154 (1974-10-01), Saito
patent: D247198 (1978-02-01), Ohie
Office Products, Jul. 1975, pp. 22-23-Sharp Cartridge Calculator.
Office Products, Mar. 1976, p. 70-Olympia Calculator at center.

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