| http://www.w3.org/ns/prov#value | - FIG. 1 shows the four elements of the socket supporting ring, namely, from bottom to top, supporting ring 1, socket cup 2, insert 3, and a securing ring 4 which serves as a securing element, the insert being made of plastics material, preferably of polyethylene, or at least partially of metal, and the other parts being made of metal, e.g. titanium, a titanium alloy, or a chrome-cobalt-molybdenum a
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