Calculator

Details Calculator Calculator

1991-05-28

1994-08-23

Douglas, Alan P.

Printing and office machinery

Typewriter or calculator

Calculator

Patent

active

D03499197

REFERENCES:
patent: D97263 (1935-10-01), Conover
patent: D222893 (1972-01-01), Neumann et al.
patent: D227511 (1973-06-01), Spilewski et al.
patent: D263603 (1982-03-01), McGourty
patent: D277108 (1985-01-01), Lundquist
patent: D289905 (1987-05-01), Goldring
patent: 1405847 (1922-02-01), Johnson
patent: 1439936 (1922-12-01), Wyckoff
patent: 1681740 (1928-08-01), Meyers
patent: 3419973 (1969-01-01), Manotas et al.
patent: 3747846 (1973-07-01), Long

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