Electronic calculator

Details Electronic calculator Electronic calculator

1987-12-09

1990-07-31

Holtje, Nelson C.

Printing and office machinery

Typewriter or calculator

Calculator

Patent

active

D03096238

REFERENCES:
patent: D245108 (1977-07-01), Pemberton
patent: D263590 (1982-03-01), Fukushima et al.
patent: D289903 (1987-05-01), Kikuchi et al.

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