| http://www.w3.org/ns/prov#value | - An apparatus according to claim 5, including a stop projecting downwardly from said underside of said first member and engageable with said second rod to limit movement of said rod along said underside of said first member, and a retaining member supported on said first member near said stop for pivotal movement about a vertical axis between first and second positions in which said retaining membe
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