| http://www.w3.org/ns/prov#value | - The directional control caster assembly of claim 10 wherein the caster is a lockable and rotatable caster, the caster support and caster wheel being rotatable relative to the mounting shaft when the key member of the locking washer is in the keyway in the mounting shaft, the caster including a locking mechanism connected to the caster support, the locking mechanism being releasably lockable to pre
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