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Heat exchanger
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Patent number 5,915,465
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Issue date Jun 29, 1999
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Deutsche Babcock-Borsig Aktiengesellschaft
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Michael Fix
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F28 - HEAT EXCHANGE IN GENERAL
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1839986
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Patent number 1,839,986
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Issue date Jan 5, 1932
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F24 - HEATING RANGES VENTILATING
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918197
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Patent number 918,197
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Issue date Apr 13, 1909
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F28 - HEAT EXCHANGE IN GENERAL
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477812
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Patent number 477,812
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Issue date Jun 28, 1892
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F28 - HEAT EXCHANGE IN GENERAL
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339442
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Patent number 339,442
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Issue date Apr 6, 1886
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F24 - HEATING RANGES VENTILATING
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206403
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Patent number 206,403
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Issue date Jul 30, 1878
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F28 - HEAT EXCHANGE IN GENERAL
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191834
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Patent number 191,834
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Issue date Jun 12, 1877
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F28 - HEAT EXCHANGE IN GENERAL
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147544
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Patent number 147,544
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Issue date Feb 17, 1874
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F28 - HEAT EXCHANGE IN GENERAL
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45556
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Patent number 45,556
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Issue date Dec 20, 1864
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F24 - HEATING RANGES VENTILATING