Coaxial ducts define air draft passage and annular passage for heat exchange fluid

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    1920365

    • Patent number 1,920,365
    • Issue date Aug 1, 1933
    • F28 - HEAT EXCHANGE IN GENERAL
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    1863678

    • Patent number 1,863,678
    • Issue date Jun 21, 1932
    • F28 - HEAT EXCHANGE IN GENERAL
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    1810973

    • Patent number 1,810,973
    • Issue date Jun 23, 1931
    • F28 - HEAT EXCHANGE IN GENERAL
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    1732258

    • Patent number 1,732,258
    • Issue date Oct 22, 1929
    • F28 - HEAT EXCHANGE IN GENERAL
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    1695959

    • Patent number 1,695,959
    • Issue date Dec 18, 1928
    • F28 - HEAT EXCHANGE IN GENERAL
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    1670618

    • Patent number 1,670,618
    • Issue date May 22, 1928
    • F28 - HEAT EXCHANGE IN GENERAL
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    1661116

    • Patent number 1,661,116
    • Issue date Feb 28, 1928
    • F28 - HEAT EXCHANGE IN GENERAL
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    1541610

    • Patent number 1,541,610
    • Issue date Jun 9, 1925
    • F28 - HEAT EXCHANGE IN GENERAL
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    1514105

    • Patent number 1,514,105
    • Issue date Nov 4, 1924
    • F28 - HEAT EXCHANGE IN GENERAL
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    1467316

    • Patent number 1,467,316
    • Issue date Sep 11, 1923
    • F28 - HEAT EXCHANGE IN GENERAL
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    1393740

    • Patent number 1,393,740
    • Issue date Oct 18, 1921
    • F28 - HEAT EXCHANGE IN GENERAL
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    1371725

    • Patent number 1,371,725
    • Issue date Mar 15, 1921
    • F28 - HEAT EXCHANGE IN GENERAL
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    1342680

    • Patent number 1,342,680
    • Issue date Jun 8, 1920
    • F28 - HEAT EXCHANGE IN GENERAL
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    930663

    • Patent number 930,663
    • Issue date Aug 10, 1909
    • F28 - HEAT EXCHANGE IN GENERAL
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    815624

    • Patent number 815,624
    • Issue date Mar 20, 1906
    • F28 - HEAT EXCHANGE IN GENERAL
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    801004

    • Patent number 801,004
    • Issue date Oct 3, 1905
    • F28 - HEAT EXCHANGE IN GENERAL
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    762203

    • Patent number 762,203
    • Issue date Jun 7, 1904
    • F28 - HEAT EXCHANGE IN GENERAL
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    742672

    • Patent number 742,672
    • Issue date Oct 27, 1903
    • F28 - HEAT EXCHANGE IN GENERAL
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    742674

    • Patent number 742,674
    • Issue date Oct 27, 1903
    • F28 - HEAT EXCHANGE IN GENERAL
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    661862

    • Patent number 661,862
    • Issue date Nov 13, 1900
    • F28 - HEAT EXCHANGE IN GENERAL
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    609935

    • Patent number 609,935
    • Issue date Aug 30, 1898
    • F28 - HEAT EXCHANGE IN GENERAL
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    557211

    • Patent number 557,211
    • Issue date Mar 31, 1896
    • F28 - HEAT EXCHANGE IN GENERAL
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    548652

    • Patent number 548,652
    • Issue date Oct 29, 1895
    • F28 - HEAT EXCHANGE IN GENERAL
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    501901

    • Patent number 501,901
    • Issue date Jul 18, 1893
    • F28 - HEAT EXCHANGE IN GENERAL
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    494963

    • Patent number 494,963
    • Issue date Apr 4, 1893
    • F24 - HEATING RANGES VENTILATING
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    447923

    • Patent number 447,923
    • Issue date Mar 10, 1891
    • F28 - HEAT EXCHANGE IN GENERAL
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    317544

    • Patent number 317,544
    • Issue date May 12, 1885
    • F28 - HEAT EXCHANGE IN GENERAL
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    308288

    • Patent number 308,288
    • Issue date Nov 18, 1884
    • F28 - HEAT EXCHANGE IN GENERAL
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    294854

    • Patent number 294,854
    • Issue date Mar 11, 1884
    • F28 - HEAT EXCHANGE IN GENERAL
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    292440

    • Patent number 292,440
    • Issue date Jan 22, 1884
    • F28 - HEAT EXCHANGE IN GENERAL

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