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