4. Boring or penetrating the earth
  5. Boring with explosion in inaccessible hole
  6. With wall engaging packer or anchor
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Perforating gun assembly for use in multi-stage stimulation...

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

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Pressure responsive perforating and testing system

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

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