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Zoom lens system
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Patent number 6,809,880
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Issue date Oct 26, 2004
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PENTAX Corporation
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Masayuki Murata
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G02 - OPTICS
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Wide-angle lens system
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Patent number 6,603,610
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Issue date Aug 5, 2003
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PENTAX Corporation
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Masayuki Murata
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G02 - OPTICS
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Macro zoom lens system
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Patent number 6,385,400
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Issue date May 7, 2002
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Asahi Kogaku Kogyo Kabushiki Kaisha
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Masayuki Murata
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G02 - OPTICS
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Soft focus lens systems
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Patent number 6,212,017
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Issue date Apr 3, 2001
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Asahi Kogaku Kogyo Kabushiki Kaisha
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Masayuki Murata
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G02 - OPTICS
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Macro lens system
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Patent number 6,154,324
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Issue date Nov 28, 2000
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Asahi Kogaku Kogyo Kabushiki Kaisha
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Masayuki Murata
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G02 - OPTICS
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Macro lens system
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Patent number 6,091,903
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Issue date Jul 18, 2000
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Asahi Kogaku Kabushiki Kaisha
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Masayuki Murata
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G02 - OPTICS
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Soft-focus zoom lens system
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Patent number 5,991,093
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Issue date Nov 23, 1999
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Asahi Kogaku Kogyo Kabushiki Kaisha
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Masayuki Murata
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G02 - OPTICS