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21/2D core memory
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Patent number 4,096,583
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Issue date Jun 20, 1978
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Ampex Corporation
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Kurt Wright
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G11 - INFORMATION STORAGE
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3633184
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Patent number 3,633,184
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Issue date Jan 4, 1972
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G11 - INFORMATION STORAGE
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3564517
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Patent number 3,564,517
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Issue date Feb 16, 1971
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F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
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3482227
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Patent number 3,482,227
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Issue date Dec 2, 1969
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G11 - INFORMATION STORAGE