Electronic calculator

Details Electronic calculator Electronic calculator

1993-01-05

1994-08-30

Douglas, Alan P.

Printing and office machinery

Typewriter or calculator

Calculator

D18 1, D18 11

Patent

active

D03501493

REFERENCES:
patent: D210631 (1968-03-01), Otto
patent: D279104 (1985-06-01), Satake
patent: D285575 (1986-09-01), Satake

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