| http://www.w3.org/ns/prov#value | - A device for clamping and supportingmobile units upon railway track rails, including arms pivotally connected to each other in opposed relation, means for locking the arms in relatively separated position, said means being releasable to permit the ends of said arms to swing toward each other by gravity, rollers having a circumferential flange mounted at the lower ends of the arms, means operable t
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