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Solar heat collector unit
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Patent number 3,995,613
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Issue date Dec 7, 1976
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PPG Industries, Inc.
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Pandit G. Patil
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F24 - HEATING RANGES VENTILATING
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Solar heat collector
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Patent number 3,995,614
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Issue date Dec 7, 1976
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PPG Industries, Inc.
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Orlando J. Cerra
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F24 - HEATING RANGES VENTILATING
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Solar heat collector
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Patent number 3,974,822
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Issue date Aug 17, 1976
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PPG Industries, Inc.
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Pandit G. Patil
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F24 - HEATING RANGES VENTILATING
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