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Roof ventilator
US 2,963,956 A
Filed
: 05/10/1957
Issued
: 12/13/1960
Est. Priority Date
: 05/10/1957
Status: Expired due to Term
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Current Assignee
Francis U. Hill
Original Assignee
Francis U. Hill
Inventors
Hill, Francis U.
Application Number
US03/658,312
Time in Patent Office
1,313 Days
Field of Search
US Class Current
454/352
CPC Class Codes
F24F 7/025
with forced air circulation...
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