Electronic calculator

Details Electronic calculator Electronic calculator

1989-01-27

1991-06-25

Holtje, Nelson C.

Printing and office machinery

Typewriter or calculator

Calculator

Patent

active

D03177785

REFERENCES:
patent: D276625 (1984-12-01), Kikuchi et al.
patent: D279110 (1985-06-01), Takahashi
patent: D284288 (1986-06-01), Satake
patent: D291325 (1987-08-01), Yubisui et al.
patent: D303982 (1989-10-01), Matsuoka et al.
patent: D308391 (1990-06-01), Sakaguchi et al.

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