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Air-conditioner system
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Patent number 5,065,588
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Issue date Nov 19, 1991
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Hitachi, Ltd.
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Susumu Nakayama
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F24 - HEATING RANGES VENTILATING
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Expansion valve
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Patent number 4,500,035
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Issue date Feb 19, 1985
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Hitachi, Ltd.
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Shigeaki Kuroda
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F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...
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Heat pump type refrigeration system
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Patent number 4,423,603
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Issue date Jan 3, 1984
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Hitachi, Ltd.
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Kensaku Oguni
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F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...