4. Boring or penetrating the earth
  5. Boring with explosion in inaccessible hole
  6. Concave-shaped charge
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High density perforating gun system

Boring or penetrating the earth – Boring with explosion in inaccessible hole – Concave-shaped charge
Patent

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High-energy combined well perforating device

Boring or penetrating the earth – Boring with explosion in inaccessible hole – Concave-shaped charge
Reexamination Certificate

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High-velocity jet and propellant fracture device for gas and oil

Boring or penetrating the earth – Boring with explosion in inaccessible hole – Concave-shaped charge
Patent

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