4. Boring or penetrating the earth
  5. With expansible bore wall anchor
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Device for anchoring a drill string in a borehole

Boring or penetrating the earth – With expansible bore wall anchor
Reexamination Certificate

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Down reaming apparatus having hydraulically controlled stabilize

Boring or penetrating the earth – With expansible bore wall anchor
Patent

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Drill string anchor

Boring or penetrating the earth – With expansible bore wall anchor
Patent

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Drilling latch apparatus

Boring or penetrating the earth – With expansible bore wall anchor
Patent

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