| http://www.w3.org/ns/prov#value | - a screw having a cone shaped body and a head including at least a female thread, cap assembled surface, and a head block; an inner bolt having a male thread at an outer circumference to be inserted and mounted in the head of the screw; an outer cap having an inner cavity to cover the head of the screw, the inner cavity of the outer cap includes a first and second step surface having different inne
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