Electronic calculator

Details Electronic calculator Electronic calculator

1995-02-15

1995-12-05

Douglas, Alan P.

Printing and office machinery

Typewriter or calculator

Calculator

Patent

active

D03648907

REFERENCES:
patent: D236353 (1975-08-01), Link
patent: D241852 (1976-10-01), Sugo
patent: D251634 (1979-04-01), Sulek et al.
patent: D276242 (1984-11-01), Sakamoto
patent: D292222 (1987-10-01), Stern
patent: D309910 (1990-08-01), Sakaguchi et al.
patent: D334736 (1993-04-01), Sawada et al.
patent: D353827 (1994-12-01), Shigemura et al.

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