| http://www.w3.org/ns/prov#value | - a shell positioned outside of the perforator, the shell including a body and a pair of arms (i) connected hingedly to the body and (ii) extending angularly away from the body toward the piercing end of the perforator, the shell further including members each having a first end connected hingedly to one of the arms and a second end contacting the perforator, the members operable to push the perfora
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