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Ventilating apparatus
US 3,036,509 A
Filed
: 05/23/1960
Issued
: 05/29/1962
Est. Priority Date
: 05/23/1960
Status: Expired due to Term
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Current Assignee
John F. Babbitt
Original Assignee
John F. Babbitt
Inventors
Babbitt, John F.
Application Number
US04/030,907
Time in Patent Office
736 Days
Field of Search
US Class Current
454/356
CPC Class Codes
F04D 19/022
with concentric rows of vanes;
F04D 25/166
using fans
F24F 7/025
with forced air circulation...
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