Keypad with a calculator

Details Keypad with a calculator Keypad with a calculator

1993-12-17

1996-02-20

Douglas, Alan P.

Printing and office machinery

Typewriter or calculator

Calculator

D14100

Patent

active

D03672891

REFERENCES:
patent: D261528 (1981-10-01), Sakai et al.
patent: D289761 (1987-05-01), Matulock
patent: D299251 (1989-01-01), Endo et al.

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