4. Boring or penetrating the earth
  5. Wedging slip assembly for supporting a pipe or rod
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Pipe die method and apparatus

Boring or penetrating the earth – Wedging slip assembly for supporting a pipe or rod
Patent

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Pipe gripping die

Boring or penetrating the earth – Wedging slip assembly for supporting a pipe or rod
Patent

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Power slip for drillpipe

Boring or penetrating the earth – Wedging slip assembly for supporting a pipe or rod
Reexamination Certificate

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