Printing and office machinery – Typewriter or calculator – Calculator
Patent
1985-10-31
1988-10-18
Zarfas, Louis S.
Printing and office machinery
Typewriter or calculator
Calculator
Patent
active
D02981432
REFERENCES:
patent: D203827 (1966-02-01), Stevens
patent: D253438 (1979-11-01), Markley
patent: 3971914 (1976-07-01), O'Neal et al.
patent: 4178501 (1979-12-01), Luther
patent: 4641240 (1987-02-01), Boram
Carson Manufacturing Company, Inc.
Zarfas Louis S,.
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