4. Boring or penetrating the earth
  5. Boring with explosion in inaccessible hole
  6. Concave-shaped charge
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Chamber isolator and sealing means for borehole perforating tool

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

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Charge holder apparatus

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

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Charge holder apparatus

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

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