Electronic calculator

Details Electronic calculator Electronic calculator

1988-11-28

1991-07-02

Holtje, Nelson C.

Printing and office machinery

Typewriter or calculator

Calculator

D14100

Patent

active

D03179354

REFERENCES:
patent: D279688 (1985-07-01), Kitai et al.
patent: D285805 (1986-09-01), Yubisui et al.
patent: D309601 (1990-07-01), Sawada et al.
patent: D309749 (1990-08-01), Ido
patent: 4405991 (1983-09-01), Stanley
patent: 4662518 (1987-05-01), Chiappetta et al.

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