Calculator

Details Calculator Calculator

1992-01-15

1993-10-12

Douglas, Alan P.

Printing and office machinery

Typewriter or calculator

Calculator

Patent

active

D03402550

REFERENCES:
patent: D297547 (1988-09-01), Sasaki
Hong Kong Enterprise, Jul. 1985, p. 184, Calculator #10-838, top right corner of pg.
Hong Kong Enterprise Mar. 1989, p. 131, Calculator #822, top right of pg.

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