Electronic calculator

Details Electronic calculator Electronic calculator

1991-12-23

1993-05-25

Douglas, Alan P.

Printing and office machinery

Typewriter or calculator

Calculator

Patent

active

D03358925

REFERENCES:
patent: D248595 (1978-07-01), Beitler et al.
patent: D251330 (1979-03-01), Kurosu et al.
patent: D287024 (1986-12-01), Satake
patent: D303112 (1989-08-01), Desrochers

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