| http://www.w3.org/ns/prov#value | - ird contact ring, said fourth contact ring being formed of anelectrically conductive material and being connected to a section of said housing other than the section to which said third contact ring is connected, said fourth contact ring having an annular side surface which faces radially inwardly toward and iscoaxial with said radially outwardly facing side surface of said third contact ring, a s
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