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Heat exchanger
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Patent number 4,962,809
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Issue date Oct 16, 1990
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Rolls-Royce plc
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Bryan L. Belcher
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F28 - HEAT EXCHANGE IN GENERAL
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Heat exchanging system
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Patent number 4,582,129
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Issue date Apr 15, 1986
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Matsushita Electric Industrial Co., Ltd.
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Nobuyuki Yano
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F24 - HEATING RANGES VENTILATING
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3161233
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Patent number 3,161,233
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Issue date Dec 15, 1964
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B64 - AIRCRAFT AVIATION COSMONAUTICS
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2507604
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Patent number 2,507,604
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Issue date May 16, 1950
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F28 - HEAT EXCHANGE IN GENERAL
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2070223
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Patent number 2,070,223
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Issue date Feb 9, 1937
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F28 - HEAT EXCHANGE IN GENERAL
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1493295
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Patent number 1,493,295
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Issue date May 6, 1924
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F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS