Calculator keyboard module

Details Calculator keyboard module Calculator keyboard module

1979-05-18

1982-08-31

Zarfas, Louis S.

Printing and office machinery

Typewriter or calculator

Calculator

D18 12, D1801

Patent

active

D02660059

REFERENCES:
patent: D227671 (1973-07-01), Yamamoto
patent: 3617661 (1971-11-01), Nome et al.
patent: 3721778 (1973-03-01), Seeger, Jr. et al.
patent: 3736397 (1973-05-01), Pedersen

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