{HEAD ~ The adjustable ring} 1 additionally comprising {TAIL ~ means} for biasing said linkage means in a predetermined position to normally maintain said adjustable ring in a contracted condition 
comprising
{ HEAD ~ The adjustable ring } 1 additionally comprising { TAIL ~ means } for biasing said linkage means in a predetermined position to normally maintain said adjustable ring in a contracted condition
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH