| http://www.w3.org/ns/prov#value | - In a player for recovering information from a selected one of a plurality of spaced information tracks on an information-bearing surface, the player including means for providing a beam of radiation to follow an information track, means for imparting relative movement between the surface and the beam along a selected track, a tracking system comprising:.Iadd.(a) .Iaddend.beam position control mean
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