| http://www.w3.org/ns/prov#value | - The gripper of claim 12 wherein the spring is a leaf spring having an arched portion between two ends inserted into slits in the carrier, the arched portion extending in a plane generally perpendicular to the axis for blocking sliding of the shoe out of the carrier along one of the directions parallel to the axis; whereby, manually depressing the arched portion toward the carrier causes each of th
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