"prohibited place"

means—

(a)        any work of defence belonging to or occupied or used by or on behalf of the Government, including—

(i)        any arsenal, military establishment or station, factory, dockyard, camp, ship, vessel or aircraft;

(ii)        any telegraph, telephone, radio or signal station or office; and

(iii)        any place used for building, repairing, making, keeping or obtaining armaments or any model or document relating thereto;