| http://www.w3.org/ns/prov#value | - Agent: Oblon, Spivak, Mcclelland Maier & Neustadt, P.C.20090122008 - Probe with a virtual marker: A probe for use in a coordinate digitizing system includes an indicator, such as a pointing tip or crosshairs, and a marker, the location of which can be determined by a marker tracking system relative to a coordinate system.
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