Electronic calculator

Details Electronic calculator Electronic calculator

1986-06-05

1988-09-06

Zarfas, Louis S.

Printing and office machinery

Typewriter or calculator

Calculator

Patent

active

D02975475

REFERENCES:
patent: D256695 (1980-09-01), Yamagami
patent: D282853 (1986-03-01), Yoshioka et al.
patent: 4558427 (1985-12-01), Takeuchi et al.
patent: 4680432 (1987-07-01), Sugiyama et al.

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