Electronic calculator

Details Electronic calculator Electronic calculator

1981-06-22

1983-06-07

Zarfas, Louis S.

Printing and office machinery

Typewriter or calculator

Calculator

D1801

Patent

active

D02692767

REFERENCES:
patent: D223865 (1972-06-01), Anzai et al.
patent: D230859 (1974-03-01), Kurosu
patent: D236353 (1975-08-01), Link
patent: D247391 (1978-02-01), Hazama et al.
patent: D256370 (1980-08-01), Ichikawa
patent: D257976 (1981-01-01), Schmidt

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