{HEAD ~ Cam surfaces} on {TAIL ~ the advancing elements}, which engage cam surfaces on adjacent members in conjunction with a pair of pneumatic cylinders which apply a reciprocating motion thereto, provide the movement of these advancing elements 
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{ HEAD ~ Cam surfaces } on { TAIL ~ the advancing elements } , which engage cam surfaces on adjacent members in conjunction with a pair of pneumatic cylinders which apply a reciprocating motion thereto , provide the movement of these advancing elements
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH