| 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, the screw is formed with a first and second round surface at a boundary of the cap assembled surface and an upper surface and a portion between the cap assembled surface and the head block respectively; an inner bolt having a male thread at an outer circumference to be inserted
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