| http://www.w3.org/ns/prov#value | - The invention is alsoadapted for use with an aircraft in flight whereby the presence of a submarine or other steel vessel may be detected by two coils of wire disposed in spaced relation with each other along the fuselage of the aircraft or. in the case or an airplane, preferably near the opposite ends of the wing, the detecting mechanism preferably including means for automatically releasing a de
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