Computer keyboard mounted calculator with attachment for spiral

Details Computer keyboard mounted calculator with attachment for spiral Computer keyboard mounted calculator with attachment for spiral

1992-12-14

1994-09-13

Douglas, Alan P.

Printing and office machinery

Typewriter or calculator

Calculator

D18 11

Patent

active

D03505596

REFERENCES:
patent: D218785 (1970-09-01), Gore
patent: D238788 (1976-02-01), Goldsamt
Hong Kong Enterprise, Sep. 1984; p. 33; #5016.

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