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3426840
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Patent number 3,426,840
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Issue date Feb 11, 1969
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F28 - HEAT EXCHANGE IN GENERAL
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2559272
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Patent number 2,559,272
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F28 - HEAT EXCHANGE IN GENERAL
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2002763
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Patent number 2,002,763
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F28 - HEAT EXCHANGE IN GENERAL
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1994690
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Patent number 1,994,690
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Issue date Mar 19, 1935
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F28 - HEAT EXCHANGE IN GENERAL
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1970317
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Patent number 1,970,317
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Issue date Aug 14, 1934
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F28 - HEAT EXCHANGE IN GENERAL
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1963506
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Patent number 1,963,506
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Issue date Jun 19, 1934
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F28 - HEAT EXCHANGE IN GENERAL
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1959013
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Patent number 1,959,013
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Issue date May 15, 1934
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F28 - HEAT EXCHANGE IN GENERAL
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1956617
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Patent number 1,956,617
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Issue date May 1, 1934
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F28 - HEAT EXCHANGE IN GENERAL
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1950112
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Patent number 1,950,112
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Issue date Mar 6, 1934
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F28 - HEAT EXCHANGE IN GENERAL
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1942559
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Patent number 1,942,559
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Issue date Jan 9, 1934
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F24 - HEATING RANGES VENTILATING
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1942560
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Patent number 1,942,560
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Issue date Jan 9, 1934
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F28 - HEAT EXCHANGE IN GENERAL
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1938588
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Patent number 1,938,588
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Issue date Dec 12, 1933
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F28 - HEAT EXCHANGE IN GENERAL
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1937713
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Patent number 1,937,713
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Issue date Dec 5, 1933
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A23 - FOODS OR FOODSTUFFS THEIR TREATMENT, NOT COVERED BY OTHER CLASSES
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1929618
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Patent number 1,929,618
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Issue date Oct 10, 1933
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F28 - HEAT EXCHANGE IN GENERAL
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1927080
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Patent number 1,927,080
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Issue date Sep 19, 1933
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F28 - HEAT EXCHANGE IN GENERAL
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1926792
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Patent number 1,926,792
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Issue date Sep 12, 1933
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F28 - HEAT EXCHANGE IN GENERAL
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1924952
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Patent number 1,924,952
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Issue date Aug 29, 1933
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F28 - HEAT EXCHANGE IN GENERAL
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1914196
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Patent number 1,914,196
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Issue date Jun 13, 1933
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F28 - HEAT EXCHANGE IN GENERAL
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1914198
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Patent number 1,914,198
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Issue date Jun 13, 1933
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F28 - HEAT EXCHANGE IN GENERAL
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1914199
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Patent number 1,914,199
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Issue date Jun 13, 1933
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F28 - HEAT EXCHANGE IN GENERAL
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1914200
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Patent number 1,914,200
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Issue date Jun 13, 1933
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F28 - HEAT EXCHANGE IN GENERAL
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1910453
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Patent number 1,910,453
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F28 - HEAT EXCHANGE IN GENERAL
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1909782
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Patent number 1,909,782
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F28 - HEAT EXCHANGE IN GENERAL
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1904555
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Patent number 1,904,555
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F28 - HEAT EXCHANGE IN GENERAL
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1890665
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Patent number 1,890,665
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Issue date Dec 13, 1932
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F28 - HEAT EXCHANGE IN GENERAL
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1886292
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Patent number 1,886,292
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Issue date Nov 1, 1932
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F28 - HEAT EXCHANGE IN GENERAL
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1884098
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Patent number 1,884,098
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Issue date Oct 25, 1932
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F28 - HEAT EXCHANGE IN GENERAL
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1845773
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Patent number 1,845,773
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Issue date Feb 16, 1932
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F24 - HEATING RANGES VENTILATING
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1808202
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Patent number 1,808,202
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Issue date Jun 2, 1931
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F28 - HEAT EXCHANGE IN GENERAL