| http://www.w3.org/ns/prov#value | - In view of the fact that such hose couplings of the detachable type necessarily have an outlet port, it frequently happened that, after the vehicles were uncoupled, dirt or other foreign substance entered the was, on subsequent recoupling of the vehicles, carried through the lines of the trailer by the iiow of fluid pressure from the tractor brake system with resultant damage to the control valve
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