| http://www.w3.org/ns/prov#value | - producing information on/from an optical disc having focus control capabilitiesUSRE39025 *Oct 13, 2000Mar 21, 2006Samsung Electronics Co., Ltd.Lens device including a light controlling mechanism and an optical pickup apparatus using a lens deviceCN100412955CNov 30, 2005Aug 20, 2008??????????????????Optical disk apparatus, focal position control method and focal position control apparatusDE19643105
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