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Phase detector
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Patent number 4,654,600
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Issue date Mar 31, 1987
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Tektronix, Inc.
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Larry R. Lockwood
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G01 - MEASURING TESTING
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3768007
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Patent number 3,768,007
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Issue date Oct 23, 1973
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G01 - MEASURING TESTING
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3340424
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Patent number 3,340,424
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Issue date Sep 5, 1967
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G01 - MEASURING TESTING