The apparatus for reducing nitrogen oxide 1, wherein the exhaust pipe, the mixer, {HEAD ~ the inlet portion} of {TAIL ~ the de nitrification catalyst reaction device}, and the de nitrification catalyst reaction device are disposed coaxially to each other 
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The apparatus for reducing nitrogen oxide 1 , wherein the exhaust pipe , the mixer , { HEAD ~ the inlet portion } of { TAIL ~ the de nitrification catalyst reaction device } , and the de nitrification catalyst reaction device are disposed coaxially to each other
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