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Low NOx boiler
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Patent number 5,067,419
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Issue date Nov 26, 1991
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Hitachi, Ltd.
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Hironobu Kobayashi
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F22 - STEAM GENERATION
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Low NOx burner
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Patent number 4,907,962
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Issue date Mar 13, 1990
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Hitachi, Ltd.
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Shigeru Azuhata
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F23 - COMBUSTION APPARATUS COMBUSTION PROCESSES
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Furnace system
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Patent number 4,653,998
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Issue date Mar 31, 1987
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Hitachi, Ltd.
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Ken-ichi Sohma
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F23 - COMBUSTION APPARATUS COMBUSTION PROCESSES
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Catalytic reactor
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Patent number 4,268,482
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Issue date May 19, 1981
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Hitachi, Ltd.
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Norio Arashi
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL