Combined desk top electronic calculator and clock

Details Combined desk top electronic calculator and clock Combined desk top electronic calculator and clock

1978-12-26

1981-01-20

Zarfas, Louis S.

Printing and office machinery

Typewriter or calculator

Calculator

D1801

Patent

active

D02579901

REFERENCES:
patent: D232833 (1974-09-01), Kitai et al.
patent: D233442 (1974-10-01), Saito
patent: D243957 (1977-04-01), Matsuda
patent: D247198 (1978-02-01), Ohie

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