Printing and office machinery – Typewriter or calculator – Calculator
Patent
1982-09-17
1984-10-23
Zarfas, Louis S.
Printing and office machinery
Typewriter or calculator
Calculator
Patent
active
D02760533
REFERENCES:
patent: 4244020 (1981-01-01), Ratcliff
patent: 4369973 (1983-01-01), Aurora et al.
Boehle William F.
Heiter Michael J.
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