| http://www.w3.org/ns/prov#value | - means slidable in said casing into and from at least in direct engagement with said wire to hold the wire against axial movement relative to the casing, said locking means including a blocking element reciprocable between an inoperative position and an operative positive in which it prevents said mobile abutment and said wire from moving relative to said casing; actuator means for moving said wir
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