Printing and office machinery – Typewriter or calculator
Patent
1978-07-10
1981-04-21
Zarfas, Louis S.
Printing and office machinery
Typewriter or calculator
D1801
Patent
active
D02589656
REFERENCES:
patent: D213230 (1969-01-01), Avboeck
patent: D230510 (1974-02-01), Sakow
patent: D235115 (1975-05-01), Link
patent: D244964 (1977-07-01), Frick
patent: 3743071 (1973-07-01), Luk
Mathis William L.
Zarfas Louis S,.
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