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3818464
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Patent number 3,818,464
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Issue date Jun 18, 1974
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G11 - INFORMATION STORAGE
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3803563
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Patent number 3,803,563
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Issue date Apr 9, 1974
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G11 - INFORMATION STORAGE
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3750118
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Patent number 3,750,118
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Issue date Jul 31, 1973
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G11 - INFORMATION STORAGE
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3739466
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Patent number 3,739,466
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Issue date Jun 19, 1973
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B24 - GRINDING POLISHING
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3698057
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Patent number 3,698,057
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Issue date Oct 17, 1972
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G11 - INFORMATION STORAGE
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3675222
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Patent number 3,675,222
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Issue date Jul 4, 1972
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G11 - INFORMATION STORAGE
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3668664
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Patent number 3,668,664
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Issue date Jun 6, 1972
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G11 - INFORMATION STORAGE
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3594897
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Patent number 3,594,897
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Issue date Jul 27, 1971
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G11 - INFORMATION STORAGE
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3587067
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Patent number 3,587,067
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Issue date Jun 22, 1971
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G11 - INFORMATION STORAGE
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3584362
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Patent number 3,584,362
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Issue date Jun 15, 1971
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G11 - INFORMATION STORAGE
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3582910
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Patent number 3,582,910
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Issue date Jun 1, 1971
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G11 - INFORMATION STORAGE