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Soot blaster
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Patent number 4,399,773
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Issue date Aug 23, 1983
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Bergemann GmbH
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Hans Schwade
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F28 - HEAT EXCHANGE IN GENERAL
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3406741
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Patent number 3,406,741
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Issue date Oct 22, 1968
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F28 - HEAT EXCHANGE IN GENERAL
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2883694
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Patent number 2,883,694
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Issue date Apr 28, 1959
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F28 - HEAT EXCHANGE IN GENERAL
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2144744
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Patent number 2,144,744
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Issue date Jan 24, 1939
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F28 - HEAT EXCHANGE IN GENERAL