Calculator

Details Calculator Calculator

1992-01-30

1993-06-29

Douglas, Alan P.

Printing and office machinery

Typewriter or calculator

Calculator

D18 2

Patent

active

D03369153

REFERENCES:
patent: D312831 (1990-12-01), Sawada et al.
patent: D317935 (1991-05-01), Sawano
patent: D328090 (1992-07-01), Ido

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