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Measurement of liquid level
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Patent number 5,249,463
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Issue date Oct 5, 1993
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Schlumberger Industries Limited
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Jolyon P. Willson
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G01 - MEASURING TESTING
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Sensor systems
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Patent number 5,195,374
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Issue date Mar 23, 1993
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Schlumberger Industries Limited
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Philip Parsons
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G01 - MEASURING TESTING
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Optical sensing systems
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Patent number 5,152,173
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Issue date Oct 6, 1992
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Schlumberger Industries Limited
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Jolyon P. Willson
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G01 - MEASURING TESTING
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Sensors
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Patent number 5,105,665
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Issue date Apr 21, 1992
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Schlumberger Industries Limited
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Philip Parsons
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G01 - MEASURING TESTING
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Optical sensor
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Patent number 4,955,238
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Issue date Sep 11, 1990
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STC PLC
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Roger E. Jones
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G01 - MEASURING TESTING
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Optical transducer systems
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Patent number 4,866,987
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Issue date Sep 19, 1989
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Schlumberger Industries Limited
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Jolyon P. Willson
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G01 - MEASURING TESTING
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