| http://www.w3.org/ns/prov#value | - a locking element including a ball ring and a locking nut associated with the head portion of the fixation element to exert a radial force on the ball ring such that the ball ring exerts a compressive force on the head portion of the fixation element to secure the head portion of the fixation element in the coupling element at any point along the length of the head of the fixation element.
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