Combined digital clock and calculator

Details Combined digital clock and calculator Combined digital clock and calculator

1978-12-18

1981-02-10

Zarfas, Louis S.

Printing and office machinery

Typewriter or calculator

Calculator

D10 15, D10 18, D1801

Patent

active

D02582210

REFERENCES:
patent: D252801 (1979-09-01), Usuda
Popular Science, 9/1977, p. 26-calculator at bottom right.

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