The apparatus 1 or 2 wherein one of said gripping elements is fixed and supported by a frame, and the other of {HEAD ~ said elements} is movably supported by {TAIL ~ said frame} 
is movably supported by
The apparatus 1 or 2 wherein one of said gripping elements is fixed and supported by a frame , and the other of { HEAD ~ said elements } is movably supported by { TAIL ~ said frame }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL