Title:
Control device for furnace gases in hot water boilers
Document Type and Number:
United States Patent 3170419
Inventors:
John, Franzen
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Publication Date:
02/23/1965
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Assignee:
John, Axel Franzen
Primary Class:
Other Classes:
165/96, 110/322, 122/235.110
International Classes:
F24H9/00