Electronic calculator

Details Electronic calculator Electronic calculator

1987-02-06

1990-02-27

Holtje, Nelson C.

Printing and office machinery

Typewriter or calculator

Calculator

Patent

active

D03063119

REFERENCES:
patent: D245108 (1977-07-01), Pemberton
patent: D269356 (1983-06-01), Yoshioka et al.
patent: D285933 (1986-09-01), Yoshioka et al.
The Office, Apr. 1985; p. 233; Technico upper left corner.
Hong Kong Enterprise; Mar. 1986; p. 207.

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