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1797892
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Patent number 1,797,892
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Issue date Mar 24, 1931
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F28 - HEAT EXCHANGE IN GENERAL
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1710579
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Patent number 1,710,579
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Issue date Apr 23, 1929
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F28 - HEAT EXCHANGE IN GENERAL
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1553384
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Patent number 1,553,384
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Issue date Sep 15, 1925
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F28 - HEAT EXCHANGE IN GENERAL
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1443870
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Patent number 1,443,870
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Issue date Jan 30, 1923
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F28 - HEAT EXCHANGE IN GENERAL
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1381618
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Patent number 1,381,618
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Issue date Jun 14, 1921
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F28 - HEAT EXCHANGE IN GENERAL
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1377912
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Patent number 1,377,912
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Issue date May 10, 1921
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F28 - HEAT EXCHANGE IN GENERAL
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323235
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Patent number 323,235
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Issue date Jul 28, 1885
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F28 - HEAT EXCHANGE IN GENERAL
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310634
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Patent number 310,634
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Issue date Jan 13, 1885
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F28 - HEAT EXCHANGE IN GENERAL
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244762
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Patent number 244,762
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Issue date Jul 26, 1881
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F28 - HEAT EXCHANGE IN GENERAL