4. Boring or penetrating the earth
  5. Processes
  6. Boring horizontal bores

William G. Riel

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Apparatus and method for a drilling assembly

Boring or penetrating the earth – Automatic control – Of advance or applied tool weight
Reexamination Certificate

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Apparatus and method for modified horizontal directional...

Boring or penetrating the earth – Processes – Boring horizontal bores
Reexamination Certificate

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Apparatus and method for modified horizontal directional...

Boring or penetrating the earth – Processes – Boring horizontal bores
Reexamination Certificate

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Dual wall drill string assembly

Boring or penetrating the earth – With tool shaft detail
Reexamination Certificate

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Profile ID: LFUS-PAI-P-2404878

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