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US 2,983,978 A
Filed
: 10/31/1957
Issued
: 05/16/1961
Est. Priority Date
: 10/31/1957
Status: Expired due to Term
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Current Assignee
Edward D. Wilgus
Original Assignee
Edward D. Wilgus
Inventors
Wilgus, Edward D.
Application Number
US03/693,729
Time in Patent Office
1,293 Days
Field of Search
US Class Current
411/555
CPC Class Codes
F16B 21/165
with balls or rollers for c...
Y10T 279/17752
Ball or roller jaws
Y10T 74/18182
Pump jack type
Y10T 74/2063
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