| http://www.w3.org/ns/prov#value | - inate frame of said source, comprising:at least two mutually orthogonal electrically conducting sheets; and a planar coil above each of said sheets, each said coil including a plurality of substantially coplanar concentric rings and being adapted for coupling to the driver for receiving signals from the driver to generate a low-distortion electromagnetic field that may be sensed by said sensor. 18
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