4. Boring or penetrating the earth
  5. Boring with explosion in inaccessible hole
  6. Firing control mechanically actuated in bore
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Electromagnetically accelerated impact oil well drill

Boring or penetrating the earth – Boring with explosion in inaccessible hole – Firing control mechanically actuated in bore
Patent

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Explosive safe/arm system for oil well perforating guns

Boring or penetrating the earth – Boring with explosion in inaccessible hole – Firing control mechanically actuated in bore
Patent

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