Printing and office machinery – Typewriter or calculator – Calculator
Patent
1979-03-26
1982-05-11
Zarfas, Louis S.
Printing and office machinery
Typewriter or calculator
Calculator
D1801
Patent
active
D02643472
REFERENCES:
patent: D226565 (1973-03-01), Klepa et al.
patent: D238951 (1976-02-01), Herr et al.
patent: 3978328 (1976-08-01), Fabry et al.
LaFrance Corporation
Zarfas Louis S,.
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