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Forced air heating system
US 2,987,258 A
Filed
: 10/09/1957
Issued
: 06/06/1961
Est. Priority Date
: 10/09/1957
Status: Expired due to Term
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Current Assignee
James E. North
Original Assignee
James E. North
Inventors
North, James E.
Application Number
US03/689,132
Time in Patent Office
1,336 Days
Field of Search
US Class Current
237/53
CPC Class Codes
F24D 5/04
with return of the air or t...
F24F 13/10
movable, e.g. dampers
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