{HEAD ~ A change} over {TAIL ~ apparatus} of exhaust gas for use with a vessel of a dump truck having an exhaust pipe connected to an engine of the dump truck, said vessel having a plurality of hollow ribs integrally formed therewith, said change over apparatus comprising: 
{ HEAD ~ A change } over { TAIL ~ apparatus } of exhaust gas for use with a vessel of a dump truck having an exhaust pipe connected to an engine of the dump truck , said vessel having a plurality of hollow ribs integrally formed therewith , said change over apparatus comprising :
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