| http://www.w3.org/ns/prov#value | - selecting a test frequency for an alternating current test input where the selected test frequency is close to an expected resonant frequency for the pick-up coil such that a pick-up coil with an expected resonant response will provide a response in a first range of values to an input at this test frequency and a pick-up coil that is no longer exhibiting an expected resonant response will provide
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