| http://www.w3.org/ns/prov#value | - Referring to FIG. 5, the simultaneous pivotal movement of the radial spokes 30 is effected by means of levers or linkage rods 40 which are preferably straight elongated members formed of sheet metal such as aluminum or steel, and are pivotally attached at one end to the radial spokes and pivotally connected at the opposite or rear end to a hub 38 of construction similar to that of hub 36, as descr
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