| http://www.w3.org/ns/prov#value | - ction, which rim corresponds to the cortical portion of the bone, said fixing surface being provided with fixing means (32, 34, 36, 60, 106, A, 208), the distance between said contact and fixing surfaces in the central zone thereof and in a fixed direction being substantially constant, said peripheral interconnecting surface including at least some portions that flare relative to said fixing direc
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