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Twist indicator gasket
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Patent number 5,076,557
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Issue date Dec 31, 1991
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Blackstone Corporation
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Paul K. Beatenbough
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F28 - HEAT EXCHANGE IN GENERAL
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Twist indicator gasket
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Patent number 5,031,924
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Issue date Jul 16, 1991
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Blackstone Corporation
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Paul K. Beatenbough
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F28 - HEAT EXCHANGE IN GENERAL
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Automotive condenser
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Patent number 4,932,469
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Issue date Jun 12, 1990
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Blackstone Corporation
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Paul K. Beatenbough
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F28 - HEAT EXCHANGE IN GENERAL
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Recuperator
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Patent number 4,113,007
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Issue date Sep 12, 1978
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General Motors Corporation
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Robert J. Flower
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F28 - HEAT EXCHANGE IN GENERAL