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3800866
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Patent number 3,800,866
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Issue date Apr 2, 1974
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F28 - HEAT EXCHANGE IN GENERAL
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3799255
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Patent number 3,799,255
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Issue date Mar 26, 1974
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F24 - HEATING RANGES VENTILATING
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2673074
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Patent number 2,673,074
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Issue date Mar 23, 1954
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F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...
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2111534
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Patent number 2,111,534
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Issue date Mar 15, 1938
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F28 - HEAT EXCHANGE IN GENERAL
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2070690
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Patent number 2,070,690
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Issue date Feb 16, 1937
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F24 - HEATING RANGES VENTILATING
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1893650
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Patent number 1,893,650
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Issue date Jan 10, 1933
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F28 - HEAT EXCHANGE IN GENERAL
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1872785
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Patent number 1,872,785
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Issue date Aug 23, 1932
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F28 - HEAT EXCHANGE IN GENERAL
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1761397
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Patent number 1,761,397
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Issue date Jun 3, 1930
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F28 - HEAT EXCHANGE IN GENERAL
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1687240
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Patent number 1,687,240
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Issue date Oct 9, 1928
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F28 - HEAT EXCHANGE IN GENERAL
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1668491
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Patent number 1,668,491
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Issue date May 1, 1928
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B60 - VEHICLES IN GENERAL
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884929
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Patent number 884,929
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Issue date Apr 14, 1908
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F28 - HEAT EXCHANGE IN GENERAL