Moving to FIG 7, {HEAD ~ air piston arrangement} 50 has been activated to move {TAIL ~ elements} 48, 48 toward lines I, I, respectively as indicated by the arrows 
activated to move
Moving to FIG 7 , { HEAD ~ air piston arrangement } 50 has been activated to move { TAIL ~ elements } 48 , 48 toward lines I , I , respectively as indicated by the arrows
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH