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Pivoting tube brush
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Patent number 10,179,352
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Issue date Jan 15, 2019
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Crossford International, LLC
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Timothy J. Kane
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A46 - BRUSHWARE
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To heat exchangers
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Patent number 6,408,936
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Issue date Jun 25, 2002
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HRS Spiratube S.L.
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Jesus Pagan Duran
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F28 - HEAT EXCHANGE IN GENERAL
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3171472
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Patent number 3,171,472
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Issue date Mar 2, 1965
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F24 - HEATING RANGES VENTILATING
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1672757
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Patent number 1,672,757
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Issue date Jun 5, 1928
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F28 - HEAT EXCHANGE IN GENERAL
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574422
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Patent number 574,422
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Issue date Jan 5, 1897
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B08 - CLEANING