| http://www.w3.org/ns/prov#value | - FIG. 2A is a block diagram of a disc identifying sensor used for the optical pickup apparatus of FIG. 1, FIG. 2B is a diagram explaining a stroke with respect to the DVD in the optical pickup apparatus of FIG. 1, and FIG. 2C is a diagram explaining a stroke with respect to the CD in the optical pickup apparatus of FIG. 1;
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