Desk-top electronic calculator

Details Desk-top electronic calculator Desk-top electronic calculator

1980-03-28

1982-03-30

Zarfas, Louis S.

Printing and office machinery

Typewriter or calculator

Calculator

D1801

Patent

active

D02636026

REFERENCES:
patent: D251271 (1979-03-01), Kobayashi
patent: D258666 (1981-03-01), Yoshioka et al.
Office Products, Apr. 1977, p. 118, Calculator at center.
Office Products, Jul. 1978, p. 90, Programmable Calculator at center.

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