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Timing signal generator
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Patent number 4,700,321
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Issue date Oct 13, 1987
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Proconics International, Inc.
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Stephen A. Ward
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G05 - CONTROLLING REGULATING
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3665499
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Patent number 3,665,499
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Issue date May 23, 1972
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G05 - CONTROLLING REGULATING
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3657525
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Patent number 3,657,525
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Issue date Apr 18, 1972
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G05 - CONTROLLING REGULATING