| http://www.w3.org/ns/prov#value | - Referring now to FIG. 2, which depicts an alternative embodiment of the present invention, which is similar to the embodiment of FIG. 1, except as discussed below, the housing plate 2, in which the ring seat 5 for the joint head 4 is formed, is held with radial clearances in a threaded pressure ring 26 bolted with the housing 1.
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