Electronic calculator

Details Electronic calculator Electronic calculator

1981-07-10

1983-09-20

Zarfas, Louis S.

Printing and office machinery

Typewriter or calculator

Calculator

D1801

Patent

active

D02706466

REFERENCES:
patent: D229065 (1973-11-01), Maeda et al.
patent: D251330 (1979-03-01), Kurobu et al.
patent: D263150 (1982-02-01), Anzai et al.
patent: D263151 (1982-02-01), Hirata et al.

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