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High density optical disk
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Patent number 5,456,961
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Issue date Oct 10, 1995
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Pioneer Electronic Corporation
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Tetsuya Iida
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G11 - INFORMATION STORAGE
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Disk manufacturing apparatus
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Patent number 5,216,219
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Issue date Jun 1, 1993
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Pioneer Electronic Corporation
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Shinichi Yokozeki
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G11 - INFORMATION STORAGE
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Acoustic diaphragm
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Patent number 4,518,443
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Issue date May 21, 1985
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Pioneer Electronic Corporation
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Shinichi Yokozeki
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C23 - COATING METALLIC MATERIAL COATING MATERIAL WITH METALLIC MATERIAL CHEMI...
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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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Vibratory elements for audio equipment
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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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