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Method of making one-piece hollow doorknobs
US 2,688,297 A
Filed
: 05/16/1949
Issued
: 09/07/1954
Est. Priority Date
: 05/16/1949
Status: Expired due to Term
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Current Assignee
Frank W. Livermont
,
Harry E. Collins
,
William F. Gresham
Original Assignee
Frank W. Livermont
,
Harry E. Collins
,
William F. Gresham
Inventors
Livermont, Frank W.
,
Collins, Harry E.
,
Gresham, William F.
Application Number
US03/093,524
Time in Patent Office
1,940 Days
Field of Search
US Class Current
72/58
CPC Class Codes
B21D 26/033
Deforming tubular bodies co...
B21D 26/039
Means for controlling the c...
B21D 26/047
Mould construction B21D26/0...
B21D 45/02
Ejecting devices
Y10T 428/12389
having variation in thickness
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