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1624749
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Patent number 1,624,749
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Issue date Apr 12, 1927
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A23 - FOODS OR FOODSTUFFS THEIR TREATMENT, NOT COVERED BY OTHER CLASSES
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1525527
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Patent number 1,525,527
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Issue date Feb 10, 1925
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A23 - FOODS OR FOODSTUFFS THEIR TREATMENT, NOT COVERED BY OTHER CLASSES
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1142826
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Patent number 1,142,826
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Issue date Jun 15, 1915
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F28 - HEAT EXCHANGE IN GENERAL
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1129698
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Patent number 1,129,698
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Issue date Feb 23, 1915
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F28 - HEAT EXCHANGE IN GENERAL
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444147
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Patent number 444,147
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Issue date Jan 6, 1891
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F28 - HEAT EXCHANGE IN GENERAL