Printing and office machinery – Typewriter or calculator – Calculator
Patent
1984-12-13
1987-03-31
Zarfas, Louis S.
Printing and office machinery
Typewriter or calculator
Calculator
Patent
active
D02890585
REFERENCES:
patent: D104237 (1937-04-01), Banta
patent: 2777617 (1957-01-01), Matt
patent: 3533551 (1968-11-01), Cole et al.
patent: 4121759 (1978-10-01), Merkel et al.
patent: 4308450 (1981-12-01), Ausman et al.
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