Printing and office machinery – Typewriter or calculator – Calculator
Patent
1978-08-21
1981-09-29
Zarfas, Louis S.
Printing and office machinery
Typewriter or calculator
Calculator
D1801
Patent
active
D02610051
REFERENCES:
patent: D227261 (1973-06-01), Liljenwall
patent: D230404 (1974-02-01), Jimbo
patent: D243535 (1977-03-01), Ikeda
patent: D247391 (1978-02-01), Hazama et al.
patent: D249093 (1978-08-01), Hazama et al.
patent: 4158230 (1979-06-01), Washizuka et al.
Ichikawa Shinpei
Welch Robert A.
Heiting Leo N.
Marshall, Jr. Robert D.
Sharp Melvin
Texas Instruments Incorporated
Zarfas Louis S,.
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