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Tape cassette
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Patent number 5,774,312
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Issue date Jun 30, 1998
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Sony Corporation
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Masanori Abe
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Tape cassette
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Patent number 5,024,394
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Issue date Jun 18, 1991
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Sony Corporation
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Kazuo Ozawa
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G11 - INFORMATION STORAGE
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Cassette reel
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Patent number 4,995,565
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Issue date Feb 26, 1991
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Sony Corporation
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Kiyoshi Urayama
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G11 - INFORMATION STORAGE
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Tape cassette
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Patent number 4,706,149
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Issue date Nov 10, 1987
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Sony Corporation
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Tetsuo Machida
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Magnetic disc device
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Patent number 4,544,977
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Issue date Oct 1, 1985
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Sony Corporation
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Kazuo Ozawa
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G11 - INFORMATION STORAGE
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