| http://www.w3.org/ns/prov#value | - Therefore, one of the right and left propelling wheels 7 acts as fulcrum to hold the conveyor cart A against inclination even when there occurs a difference in attractive force between the right and left electromagnets 10 attracting the right and left retaining members 11 opposed thereto, respectively, or when there occurs a difference in distance from the right and left retaining members 11 to th
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