4. Boring or penetrating the earth
  5. Boring with explosion in inaccessible hole
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Redundant firing mechanism for a well perforating gun

Boring or penetrating the earth – Boring with explosion in inaccessible hole – With wall engaging packer or anchor
Patent

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Rotational alignment method and apparatus for tubing conveyed pe

Boring or penetrating the earth – Boring with explosion in inaccessible hole – With position orienting or indicating
Patent

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