Electronic calculator

Details Electronic calculator Electronic calculator

1992-07-28

1994-09-20

Holtje, Nelson C.

Printing and office machinery

Typewriter or calculator

Calculator

D18 11

Patent

active

D03507637

REFERENCES:
patent: D240736 (1976-07-01), Pemberton
patent: D273201 (1984-03-01), Sakata
patent: D276242 (1984-11-01), Sakamoto
patent: D307595 (1990-05-01), Yubisui et al.
patent: 4259568 (1981-03-01), Dynesen

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