Calculator

Details Calculator Calculator

1993-01-05

1994-10-18

Douglas, Alan P.

Printing and office machinery

Typewriter or calculator

Calculator

Patent

active

D03516148

REFERENCES:
patent: D226485 (1973-03-01), Kitai
patent: D243535 (1977-03-01), Ikeda
Hong Kong Enterprise; Oct. 1989; pp. 305 & 392; Simulative Football Calc. upper right & EC-7018k Calc. middle of p. 392.

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