Desk-top electronic calculator

Details Desk-top electronic calculator Desk-top electronic calculator

1986-04-22

1989-01-03

Zarfas, Louis S.

Printing and office machinery

Typewriter or calculator

Calculator

Patent

active

D02992515

REFERENCES:
patent: D226197 (1973-01-01), Liljenwall
patent: D236350 (1975-08-01), Stoltz et al.
patent: D261528 (1981-10-01), Sakai et al.
patent: D286056 (1986-10-01), Kikuchi et al.
patent: D289045 (1987-03-01), Brown
patent: D294151 (1988-02-01), Kuo

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