| http://www.w3.org/ns/prov#value | - An airport, airfield, helipad or aircraft carrier having a fuel supply or storage system comprising a portable beacon that can be positioned to deter damaging access to a deactivatable hazard, the beacon including means for deactivating the hazard in the event of impending damaging access to the hazard and proximity sensor means responsive to proximity of a threat, wherein the proximity sensor mea
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