Printing and office machinery – Typewriter or calculator – Calculator
Patent
1980-06-23
1982-07-27
Feifer, Melvin B.
Printing and office machinery
Typewriter or calculator
Calculator
D10 65, D10 73, D24 17, D24 99, D1801
Patent
active
D02655659
REFERENCES:
patent: 459519 (1891-09-01), Collins
patent: 3045353 (1962-07-01), Barbosa
patent: 3732399 (1973-05-01), Finley
patent: 3733708 (1973-05-01), Goodman
Chovanes Eugene
Feifer Melvin B.
Jackson Edward Lovett
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