4. Boring or penetrating the earth
  5. Automatic control
  6. Of fluid pressure below ground

Albert S. Johnson

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Method for circulating and maintaining drilling mud in a wellbor

Boring or penetrating the earth – Automatic control – Of fluid pressure below ground
Patent

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Transducer carrier for ultrasonic testing

Measuring and testing – Vibration – By mechanical waves
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Profile ID: LFUS-PAI-P-1898265

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