| http://www.w3.org/ns/prov#value | - c) the gripping surfaces and/or the surfaces of the clamping piece which act in combination with the expanding projection are set at such an angle that as they move relative to each other, the clamping piece or the expanding projection also move radially towards the housing or away from it and, depending upon the relative position, are held on the housing with varying degrees of force.
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