| http://www.w3.org/ns/prov#value | - tubes, said ball and socket joint including a ball head, a neck and a coupling for connection with a water outlet pipe, and a socket ring, means securing the ring for turning movement with the telescoping tubes as a unit around the ball head, said socket ring having a substantially semi-circular flange partially extending around the neck, and the upper edge of said flange having notches of difiere
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