Electronic calculator

Details Electronic calculator Electronic calculator

1986-04-01

1989-09-26

Holtje, Nelson C.

Printing and office machinery

Typewriter or calculator

Calculator

Patent

active

D03036774

REFERENCES:
patent: D279104 (1985-06-01), Satake
patent: D279110 (1985-06-01), Takahashi
patent: D285575 (1986-09-01), Satake
patent: D290374 (1987-06-01), Yubishi
patent: D291325 (1987-08-01), Yubisui
Best Co., 1978, p. 359, Letter A.
W. Bell Co., 1982, p. 243, Letter E.
Evans Co., 1983/1984, p. 295, #3.

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