4. Boring or penetrating the earth
  5. Automatic control

David Alexander Curry

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Method and apparatus for determining potential abrasivity in...

Boring or penetrating the earth – With bit wear signal generating
Reexamination Certificate

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Method and apparatus for determining potential for drill bit...

Boring or penetrating the earth – Automatic control
Reexamination Certificate

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Method and apparatus for determining potential interfacial...

Data processing: measuring – calibrating – or testing – Measurement system in a specific environment – Earth science
Reexamination Certificate

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Optimizing drilling performance using a selected drilling fluid

Boring or penetrating the earth – Automatic control
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Profile ID: LFUS-PAI-P-2021910

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