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F28 - HEAT EXCHANGE IN GENERAL
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Patent number 3,472,315
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F28 - HEAT EXCHANGE IN GENERAL
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3407873
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Patent number 3,407,873
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F28 - HEAT EXCHANGE IN GENERAL
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3390722
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Patent number 3,390,722
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F22 - STEAM GENERATION
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Patent number 3,204,692
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F28 - HEAT EXCHANGE IN GENERAL
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3139926
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F28 - HEAT EXCHANGE IN GENERAL
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F28 - HEAT EXCHANGE IN GENERAL
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F28 - HEAT EXCHANGE IN GENERAL