4. Boring or penetrating the earth
  5. Boring with explosion in inaccessible hole
  6. Independent firing of plural charges
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Secure activation of a downhole device

Boring or penetrating the earth – Boring with explosion in inaccessible hole – Independent firing of plural charges
Reexamination Certificate

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Selective firing system

Boring or penetrating the earth – Boring with explosion in inaccessible hole – Independent firing of plural charges
Patent

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Single-wire selective perforation system having firing safeguard

Boring or penetrating the earth – Boring with explosion in inaccessible hole – Independent firing of plural charges
Patent

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Single-wire selective performation system

Boring or penetrating the earth – Boring with explosion in inaccessible hole – Independent firing of plural charges
Patent

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