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Drum louver
US 3,012,494 A
Filed
: 07/14/1959
Issued
: 12/12/1961
Est. Priority Date
: 07/14/1959
Status: Expired due to Term
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Current Assignee
James M. Drummond
Original Assignee
James M. Drummond
Inventors
Drummond, James M.
Application Number
US03/826,988
Time in Patent Office
882 Days
Field of Search
US Class Current
454/286
CPC Class Codes
F24F 13/065
formed as cylindrical or sp...
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