| http://www.w3.org/ns/prov#value | - A characteristic feature of the present invention is that the cap member, at least, is made of an elastomer or the like and that changes configuration upon the application of applied weight, in order to engage the clutch-anchor C that is operative between the two members A and -B. The base member A is a body of suitably durable material adapted to the making of a heel, preferably a rubber-like ela
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