| http://www.w3.org/ns/prov#value | - means; transmit pulse generator means electrically connected to said transmit coil means for generating transmit current pulses and applying said current pulses to said transmit coil means, said transmit pulses being provided as groups of pulses, each group including a pulse of a first polarity followed by at least two pulses of a second and opposite polarity; sampling means electrically connected
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