Printing and office machinery – Typewriter or calculator – Calculator
Patent
1984-02-13
1986-12-23
Zarfas, Louis S.
Printing and office machinery
Typewriter or calculator
Calculator
D18 2
Patent
active
D02873702
REFERENCES:
patent: 3314601 (1967-04-01), Voo
patent: 4458320 (1984-07-01), Sutton
Brennan Mike
Stoll Scott A.
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