| http://www.w3.org/ns/prov#value | - traction means including biasing means for placing a bias upon the tether, said biasing means including bias actuation means for actuating said biasing means upon the occurrence of a predetermined event, wherein said biasing means can place a bias upon the tether toward retraction of the tether when the tether is withdrawn from said housing means and the predetermined event occurs. 18.
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