| http://www.w3.org/ns/prov#value | - The invention also embraces a fuel supply or storage system, the system comprising a portable beacon as defined herein adapted to deter collision with an exposed fuel conduit, the beacon including means co-operable with the conduit to shut off fuel flow through the conduit in the event of actual or impending collision with the beacon to prevent uncontrolled leakage of fuel through collision damage
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