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Optical recording medium
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Patent number 6,762,008
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Issue date Jul 13, 2004
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Ricoh Company, Ltd.
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Tsutomu Satoh
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G11 - INFORMATION STORAGE
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Optical recording medium
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Patent number 6,197,477
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Issue date Mar 6, 2001
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Ricoh Company, Ltd.
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Tsutomu Satoh
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G11 - INFORMATION STORAGE
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Optical information recording medium
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Patent number 5,998,093
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Issue date Dec 7, 1999
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Ricoh Company, Ltd.
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Tatsuya Tomura
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C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
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