| http://www.w3.org/ns/prov#value | - A coupler, as in claim 6, in which said converging portion is a frusto-conical surface surrounding a central axis and said collet moving means comprises screw threads formed on an outer surface of said collet and cooperating screw threads formed on said inner surface of said collet nut such that said distal end may be drawn toward said frusto-conical surface by relative rotation of said collet and
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