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Liquefied gas boilers
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Patent number 5,014,773
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Issue date May 14, 1991
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The BOC Group plc
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Carlo Beduz
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F28 - HEAT EXCHANGE IN GENERAL
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3493040
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Patent number 3,493,040
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Issue date Feb 3, 1970
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F28 - HEAT EXCHANGE IN GENERAL
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642802
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Patent number 642,802
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Issue date Feb 6, 1900
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F28 - HEAT EXCHANGE IN GENERAL
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90094
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Patent number 90,094
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Issue date May 18, 1869
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F28 - HEAT EXCHANGE IN GENERAL