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3909932
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Patent number 3,909,932
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Issue date Oct 7, 1975
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G11 - INFORMATION STORAGE
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3807042
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Patent number 3,807,042
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Issue date Apr 30, 1974
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G11 - INFORMATION STORAGE
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3789505
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Patent number 3,789,505
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Issue date Feb 5, 1974
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G11 - INFORMATION STORAGE
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3783504
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Patent number 3,783,504
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Issue date Jan 8, 1974
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G11 - INFORMATION STORAGE
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3718776
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Patent number 3,718,776
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Issue date Feb 27, 1973
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G11 - INFORMATION STORAGE
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3712575
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Patent number 3,712,575
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Issue date Jan 23, 1973
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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3701858
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Patent number 3,701,858
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Issue date Oct 31, 1972
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G11 - INFORMATION STORAGE
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3686751
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Patent number 3,686,751
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Issue date Aug 29, 1972
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G11 - INFORMATION STORAGE
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3684841
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Patent number 3,684,841
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Issue date Aug 15, 1972
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G11 - INFORMATION STORAGE
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3678576
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Patent number 3,678,576
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Issue date Jul 25, 1972
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G11 - INFORMATION STORAGE
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3663765
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Patent number 3,663,765
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Issue date May 16, 1972
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G11 - INFORMATION STORAGE