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Ring frequency divider
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Patent number 9,595,971
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Issue date Mar 14, 2017
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Cirrus Logic, Inc.
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Yousof Mortazavi
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H03 - BASIC ELECTRONIC CIRCUITRY
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Self-timed timer
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Patent number 8,693,607
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Issue date Apr 8, 2014
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Richard L. Schober
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G04 - HOROLOGY
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Stop watch
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Patent number 4,211,066
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Issue date Jul 8, 1980
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Kabushiki Kaisha Daini Seikosha
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Yasuo Kusumoto
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G04 - HOROLOGY