| http://www.w3.org/ns/prov#value | - In FIGS. 1 and 2, a reference numeral 1 designates a housing; 2, a; 3, a central shaft; 4, the unit main body; 5, a stationary plate; 6 a turn table; 7, a ball; 8, a conveyer; and 9, a base.The housing 1 is a box-like member formed with a flange 10 mounted on the outer periphery of its upper end and an annular cut off 11 on the inner periphery of its upper end, respectively.
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