Calculator

Details Calculator Calculator

1992-05-27

1993-07-20

Douglas, Alan P.

Printing and office machinery

Typewriter or calculator

Calculator

Patent

active

D03376036

REFERENCES:
patent: D276536 (1984-11-01), Siefert
patent: D308984 (1990-07-01), Chu
patent: D326471 (1992-05-01), Chen
Hong Kong Enterprise, Jul. 1988, p. 206, calculators GE-C123 & GE-C130--upper left side of pg.
Cole-Parmer Co., Nov. 1986, p. 871, Digital up/down timer--f.
Hong Kong Enterprise, Sep. 1984, p. 311, calculator--top right corner of pg.--Universal Sales Co.

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