Typewriting machines – Platen or platen-moving mechanism – Cylindrical platen
Patent
1977-05-02
1981-01-27
Sewell, Paul T.
Typewriting machines
Platen or platen-moving mechanism
Cylindrical platen
400689, B41J 11053
Patent
active
042472130
ABSTRACT:
A noise-reducing hollow platen having a hard external tube filled with steel or lead spheres.
REFERENCES:
patent: 503534 (1893-08-01), Goff
patent: 960679 (1910-06-01), McLaughlin
patent: 1452824 (1923-04-01), Bosworth
patent: 1693533 (1928-11-01), Stickney
patent: 1721385 (1929-07-01), Furnivall et al.
patent: 3057450 (1962-10-01), Gallagher
patent: 3775087 (1973-11-01), Ritter
Sewell Paul T.
Smith Robert S.
U.S. Philips Corporation
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