| http://www.w3.org/ns/prov#value | - g and merging into the same and a relatively small opening through the closed end thereof centrally of the tapered opening and leading into the same, a plug including a portion tapered complementary to the taper of the tapered opening in said barrel to adapt the same for wedging engagement in the said tapered opening, said plug being provided with a pair of diametrically opposed longitudinal groov
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