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1988642
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Patent Grant
1988642
References
Source
Patent Number
1,988,642
Date Filed
Not available
Date Issued
Tuesday, January 22, 1935
89 years ago
CPC
F28D21/0008 - Air heaters
Y10S165/337 - Heating or cooling means entirely surrounded by air draft passage forming casing
Y10S165/901 - Heat savers
US Classifications
165 - Heat exchange
126 - Stoves and furnaces
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