| http://www.w3.org/ns/prov#value | - However, it is to be understood that if desired the cover shell 18 may be made of a completely rigid material, as for example a suitable metal, and another type of axial lock which will allow rotation may be substituted for the bead 24 and groove 26, as for example a snapring type of engagement (not shown) wherein an expansible or contractible snapring is fitted into opposed grooves in both the bo
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