On front surfaces thereof, {HEAD ~ gripper arms} 52, 54 have {TAIL ~ pins} 88, 90 projecting therefrom 
On front surfaces thereof , { HEAD ~ gripper arms } 52 , 54 have { TAIL ~ pins } 88 , 90 projecting therefrom
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH