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Data transmission and storage
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Patent number 5,038,374
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Issue date Aug 6, 1991
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Dynamic Broadcasting Network, Inc.
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Malcolm E. A. Kaufman
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Electronic sketching device
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Patent number 4,887,968
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Issue date Dec 19, 1989
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The Ohio Art Company
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James C. Wickstead
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G06 - COMPUTING CALCULATING COUNTING
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Electronic sketching device
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Patent number 4,764,763
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Issue date Aug 16, 1988
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The Ohio Art Company
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James C. Wickstead
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G06 - COMPUTING CALCULATING COUNTING