Electronic calculator

Details Electronic calculator Electronic calculator

1987-04-06

1990-08-14

Holtje, Nelson C.

Printing and office machinery

Typewriter or calculator

Calculator

Patent

active

D03099105

REFERENCES:
patent: D256694 (1980-09-01), Kitai
patent: D269355 (1983-06-01), Yamagami
patent: D284200 (1986-06-01), Hayashi
patent: D293920 (1988-01-01), Yubisui et al.
patent: D297947 (1988-10-01), Yubisui et al.
Best, 1985/86; p. 307; #15 Casio; upper left corner.
W. Bell, 1986, p. 289; #16 Texas Instruments; lower left corner.

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