4. Boring or penetrating the earth
  5. Bit or bit element
  6. Casing shoe type

Michael Wardley

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Casing drilling shoe

Boring or penetrating the earth – Bit or bit element – Casing shoe type
Reexamination Certificate

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Casing shoe with cutting means

Boring or penetrating the earth – Bit or bit element – Casing shoe type
Patent

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Shoe for wellbore lining tubing

Wells – Processes – Cementing – plugging or consolidating
Reexamination Certificate

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Profile ID: LFUS-PAI-P-440076

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