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-
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3604505
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Patent number 3,604,505
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Issue date Sep 14, 1971
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F24 - HEATING RANGES VENTILATING
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3524500
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Patent number 3,524,500
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Issue date Aug 18, 1970
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F28 - HEAT EXCHANGE IN GENERAL
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3195623
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Patent number 3,195,623
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Issue date Jul 20, 1965
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F24 - HEATING RANGES VENTILATING
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3137343
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Patent number 3,137,343
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Issue date Jun 16, 1964
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F28 - HEAT EXCHANGE IN GENERAL
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3022982
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Patent number 3,022,982
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Issue date Feb 27, 1962
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F28 - HEAT EXCHANGE IN GENERAL
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2856161
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Patent number 2,856,161
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Issue date Oct 14, 1958
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F28 - HEAT EXCHANGE IN GENERAL
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2752125
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Patent number 2,752,125
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Issue date Jun 26, 1956
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F28 - HEAT EXCHANGE IN GENERAL
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2703702
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Patent number 2,703,702
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Issue date Mar 8, 1955
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F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...
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2651506
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Patent number 2,651,506
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Issue date Sep 8, 1953
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F28 - HEAT EXCHANGE IN GENERAL
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2610039
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Patent number 2,610,039
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Issue date Sep 9, 1952
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F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...
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2212301
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Patent number 2,212,301
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Issue date Aug 20, 1940
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F28 - HEAT EXCHANGE IN GENERAL
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1988642
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Patent number 1,988,642
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Issue date Jan 22, 1935
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F28 - HEAT EXCHANGE IN GENERAL
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1975957
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Patent number 1,975,957
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Issue date Oct 9, 1934
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F28 - HEAT EXCHANGE IN GENERAL
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1920365
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Patent number 1,920,365
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Issue date Aug 1, 1933
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F28 - HEAT EXCHANGE IN GENERAL
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1911197
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Patent number 1,911,197
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Issue date May 30, 1933
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F28 - HEAT EXCHANGE IN GENERAL
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1895075
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Patent number 1,895,075
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Issue date Jan 24, 1933
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F28 - HEAT EXCHANGE IN GENERAL
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1884097
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Patent number 1,884,097
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Issue date Oct 25, 1932
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F28 - HEAT EXCHANGE IN GENERAL
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1863678
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Patent number 1,863,678
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Issue date Jun 21, 1932
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F28 - HEAT EXCHANGE IN GENERAL
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1856454
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Patent number 1,856,454
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Issue date May 3, 1932
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F24 - HEATING RANGES VENTILATING
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1845691
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Patent number 1,845,691
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Issue date Feb 16, 1932
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F28 - HEAT EXCHANGE IN GENERAL
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1833291
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Patent number 1,833,291
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Issue date Nov 24, 1931
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F24 - HEATING RANGES VENTILATING
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1810973
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Patent number 1,810,973
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Issue date Jun 23, 1931
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F28 - HEAT EXCHANGE IN GENERAL
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1804424
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Patent number 1,804,424
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Issue date May 12, 1931
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F28 - HEAT EXCHANGE IN GENERAL
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1763754
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Patent number 1,763,754
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Issue date Jun 17, 1930
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A47 - FURNITURE DOMESTIC ARTICLES OR APPLIANCES COFFEE MILLS SPICE MILLS SUCT...
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1732258
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Patent number 1,732,258
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Issue date Oct 22, 1929
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F28 - HEAT EXCHANGE IN GENERAL
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1731807
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Patent number 1,731,807
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Issue date Oct 15, 1929
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F24 - HEATING RANGES VENTILATING
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1721149
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Patent number 1,721,149
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Issue date Jul 16, 1929
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F28 - HEAT EXCHANGE IN GENERAL