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Optical disk
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Issue date Dec 31, 1991
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Pioneer Electronic Corporation
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Hiroshi Kato
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G11 - INFORMATION STORAGE
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Tone-arm elements
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Patent number 4,366,205
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Issue date Dec 28, 1982
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Pioneer Electronic Corporation
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Tsunehiro Tsukagoshi
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C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
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Patent number 4,362,772
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Issue date Dec 7, 1982
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Pioneer Electronic Corporation
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Tsunehiro Tsukagoshi
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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