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3610333
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Patent number 3,610,333
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Issue date Oct 5, 1971
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F28 - HEAT EXCHANGE IN GENERAL
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1531199
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Patent number 1,531,199
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Issue date Mar 24, 1925
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F28 - HEAT EXCHANGE IN GENERAL
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1415432
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Patent number 1,415,432
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Issue date May 9, 1922
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F24 - HEATING RANGES VENTILATING
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1381604
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Patent number 1,381,604
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Issue date Jun 14, 1921
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F28 - HEAT EXCHANGE IN GENERAL
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1278327
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Patent number 1,278,327
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Issue date Sep 10, 1918
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F28 - HEAT EXCHANGE IN GENERAL
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1152328
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Patent number 1,152,328
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Issue date Aug 31, 1915
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F28 - HEAT EXCHANGE IN GENERAL
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999147
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Patent number 999,147
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Issue date Jul 25, 1911
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F28 - HEAT EXCHANGE IN GENERAL
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864871
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Patent number 864,871
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Issue date Sep 3, 1907
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F28 - HEAT EXCHANGE IN GENERAL
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851844
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Patent number 851,844
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Issue date Apr 30, 1907
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F28 - HEAT EXCHANGE IN GENERAL
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849369
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Patent number 849,369
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Issue date Apr 9, 1907
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F28 - HEAT EXCHANGE IN GENERAL
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831612
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Patent number 831,612
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Issue date Sep 25, 1906
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F28 - HEAT EXCHANGE IN GENERAL
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804489
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Patent number 804,489
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Issue date Nov 14, 1905
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F28 - HEAT EXCHANGE IN GENERAL
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748379
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Patent number 748,379
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Issue date Dec 29, 1903
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F28 - HEAT EXCHANGE IN GENERAL
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711769
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Patent number 711,769
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Issue date Oct 21, 1902
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F28 - HEAT EXCHANGE IN GENERAL
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599509
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Patent number 599,509
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Issue date Feb 22, 1898
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F28 - HEAT EXCHANGE IN GENERAL
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406741
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Patent number 406,741
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Issue date Jul 9, 1889
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F28 - HEAT EXCHANGE IN GENERAL
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314128
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Patent number 314,128
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Issue date Mar 17, 1885
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F28 - HEAT EXCHANGE IN GENERAL
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159728
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Patent number 159,728
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Issue date Feb 9, 1875
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F28 - HEAT EXCHANGE IN GENERAL
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127381
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Patent number 127,381
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Issue date May 28, 1872
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F28 - HEAT EXCHANGE IN GENERAL
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67504
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Patent number 67,504
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Issue date Aug 6, 1867
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F28 - HEAT EXCHANGE IN GENERAL
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48231
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Patent number 48,231
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Issue date Jun 13, 1865
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F28 - HEAT EXCHANGE IN GENERAL