4. Measuring and testing
  5. Liquid level or depth gauge

Robert G. Stapleton

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Centrifugal analyzer

Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent

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Determining saturation and permeability using mercury capillary

Measuring and testing – With fluid pressure – Porosity or permeability
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Ultrasonic sensor

Measuring and testing – Liquid level or depth gauge
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Profile ID: LFUS-PAI-P-686402

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