| http://www.w3.org/ns/prov#value | - Furthermore, although the closure structure 27 of the present invention is illustrated with the polyaxial bone screw 25 having an open receiver or head 31, it foreseen that a variety of closure structure may be used in conjunction with any type of medical implant having an open or closed head or receiver, including monoaxial bone screws, hinged bone screws, hooks and the like used in spinal surger
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