4. Boring or penetrating the earth
  5. With tool shaft detail
  6. Shaft carried guide or protector

Werner Lau

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Drill string anchor

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

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Drill string component

Boring or penetrating the earth – With tool shaft detail – Shaft carried guide or protector
Patent

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Drilling tool

Wells – Processes – Freeing stuck object – grappling or fishing in well
Patent

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Profile ID: LFUS-PAI-P-44386

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