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3645330
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Patent number 3,645,330
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Issue date Feb 29, 1972
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F28 - HEAT EXCHANGE IN GENERAL
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1869174
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Patent number 1,869,174
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Issue date Jul 26, 1932
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F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...
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1739672
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Patent number 1,739,672
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Issue date Dec 17, 1929
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F28 - HEAT EXCHANGE IN GENERAL
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1577115
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Patent number 1,577,115
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Issue date Mar 16, 1926
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F28 - HEAT EXCHANGE IN GENERAL
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810030
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Issue date Jan 16, 1906
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F28 - HEAT EXCHANGE IN GENERAL