Proportional escapement apparatus for a single element typewriter
United States Patent 3346086
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Inventors:
Cralle Jr., Walter O.
Holt, George A.
Lenney, Edwin J.
Sederholm, Douglas E.
Walton, Neil D.
Publication Date:
10/10/1967
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Assignee:
IBM
Primary Class:
400/175
Other Classes:
400/309, 400/306.100
International Classes:
B41J19/58; B41J19/64; B41J29/42; B41J19/34; B41J19/60
US Patent References:
1096010
1286186
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