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US 3,130,539 A
Filed
: 02/01/1962
Issued
: 04/28/1964
Est. Priority Date
: 02/01/1962
Status: Expired due to Term
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Current Assignee
Robert L. Davis
Original Assignee
Robert L. Davis
Inventors
Davis, Robert L.
Application Number
US04/170,864
Time in Patent Office
817 Days
Field of Search
US Class Current
368/289
CPC Class Codes
G04B 37/10
of winding stems constructi...
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