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