Printing and office machinery – Typewriter or calculator – Calculator
Patent
1984-12-26
1987-01-27
Zarfas, Louis S.
Printing and office machinery
Typewriter or calculator
Calculator
Patent
active
D02879786
REFERENCES:
patent: D146801 (1947-05-01), Lens
patent: D224019 (1972-06-01), Kalvitis
patent: D234360 (1975-02-01), Duncan
patent: D263136 (1982-02-01), Gore
Industrial Maintenance Systems, Inc.
Zarfas Louis S,.
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