Printing and office machinery – Typewriter or calculator – Element or attachment
Patent
1977-03-21
1979-02-20
Zarfas, Louis S.
Printing and office machinery
Typewriter or calculator
Element or attachment
D14 50, D14 93, D1899
Patent
active
D02511517
REFERENCES:
patent: D83408 (1931-02-01), Mahoney et al.
patent: D129764 (1941-09-01), Lauder et al.
patent: D232003 (1974-07-01), Frick
patent: D234270 (1975-02-01), Frick
patent: 3785452 (1974-01-01), Scott
Mathis William L.
Zarfas Louis S,.
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