Electronic calculator

Details Electronic calculator Electronic calculator

1992-06-25

1994-11-22

Douglas, Alan P.

Printing and office machinery

Typewriter or calculator

Calculator

Patent

active

D03527301

REFERENCES:
patent: D280418 (1985-09-01), Hayashi et al.
patent: D285575 (1986-09-01), Satake
Best Catalog; 1985/86; p. 305; #14 Casio Model DL-220 calculator.

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