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