4. Boring or penetrating the earth
  5. Automatic control

Clive Jarvis

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Method of determining characteristics of a rotary drag-type dril

Boring or penetrating the earth – Automatic control
Patent

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Rotary drill bits with extended bearing surfaces

Boring or penetrating the earth – Bit or bit element – With fluid conduit lining or element
Patent

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Profile ID: LFUS-PAI-P-1150289

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