Electronic calculator

Details Electronic calculator Electronic calculator

1986-08-22

1989-10-10

Holtje, Nelson C.

Printing and office machinery

Typewriter or calculator

Calculator

Patent

active

D03039803

REFERENCES:
patent: D285933 (1986-09-01), Yoshioka
patent: D287024 (1986-12-01), Satake
patent: D289903 (1987-05-01), Kikuchi
patent: D294369 (1988-02-01), Yubisui
Best, 1985, p. 306, #9.

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