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Draft controlling stack damper mechanism for conserving heat in furnaces
US 2,508,885 A
Filed
: 03/15/1944
Issued
: 05/23/1950
Est. Priority Date
: 03/15/1944
Status: Expired due to Term
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Current Assignee
Ted J. Mackay
Original Assignee
Ted J. Mackay
Inventors
Mackay, Ted J.
Application Number
US02/526,611
Time in Patent Office
2,260 Days
Field of Search
US Class Current
431/20
CPC Class Codes
F23L 11/005
for closing the flue during...
F23L 13/02
pivoted about a single axis...
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