Printing and office machinery – Typewriter or calculator – Calculator
Patent
1985-04-22
1987-04-28
Zarfas, Louis S.
Printing and office machinery
Typewriter or calculator
Calculator
Patent
active
D02895285
REFERENCES:
patent: D244395 (1977-05-01), Garvey et al.
patent: D274179 (1984-06-01), Siwula
patent: 2892266 (1959-06-01), Tomkins
Ferrell Don E.
Zarfas Louis S,.
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