Calculator

Details Calculator Calculator

1992-01-02

1993-06-29

Douglas, Alan P.

Printing and office machinery

Typewriter or calculator

Calculator

Patent

active

D03369218

REFERENCES:
patent: D300539 (1989-04-01), Wong
patent: D317755 (1991-06-01), Lerude et al.
patent: 4142236 (1979-02-01), Martz et al.

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