Electronic calculator

Details Electronic calculator Electronic calculator

1984-09-25

1986-11-04

Zarfas, Louis S.

Printing and office machinery

Typewriter or calculator

Calculator

Patent

active

D02865440

REFERENCES:
patent: D234773 (1975-04-01), Herr
patent: D238493 (1976-01-01), Maeda
patent: D240737 (1976-07-01), McCain et al.
patent: D281435 (1985-11-01), Sawada et al.

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