Printing and office machinery – Typewriter or calculator – Calculator
Patent
1980-11-04
1983-03-08
Zarfas, Louis S.
Printing and office machinery
Typewriter or calculator
Calculator
D1801
Patent
active
D02681862
REFERENCES:
patent: D232836 (1974-09-01), Kitai
patent: D248995 (1978-08-01), Hazama et al.
patent: D258221 (1981-02-01), Shimasaki
patent: 3314601 (1967-04-01), Voo
patent: 4303398 (1981-12-01), Yoseloff
Mandel Evan W.
Mayer Edward
Ekstrand Roy A.
Goldman Ronald M.
Mattel Inc.
Shirk Max E.
Zarfas Louis S,.
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