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Preheating glass batch
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Patent number 4,422,847
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Issue date Dec 27, 1983
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Owens-Corning Fiberglas Corporation
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Mark A. Propster
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F28 - HEAT EXCHANGE IN GENERAL
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3862015
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Patent number 3,862,015
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Issue date Jan 21, 1975
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F28 - HEAT EXCHANGE IN GENERAL
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3768552
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Patent number 3,768,552
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Issue date Oct 30, 1973
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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3722401
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Patent number 3,722,401
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Issue date Mar 27, 1973
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A23 - FOODS OR FOODSTUFFS THEIR TREATMENT, NOT COVERED BY OTHER CLASSES
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3390078
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Patent number 3,390,078
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Issue date Jun 25, 1968
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F28 - HEAT EXCHANGE IN GENERAL
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3388481
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Patent number 3,388,481
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Issue date Jun 18, 1968
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F28 - HEAT EXCHANGE IN GENERAL
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2860174
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Patent number 2,860,174
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Issue date Nov 11, 1958
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F28 - HEAT EXCHANGE IN GENERAL