4. Boring or penetrating the earth
  5. Boring with explosion in inaccessible hole
  6. With bore condition firing control, or compensating means
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System for indicating the firing of a perforating gun

Boring or penetrating the earth – Boring with explosion in inaccessible hole – With bore condition firing control – or compensating means
Reexamination Certificate

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Universal perforating gun firing head

Boring or penetrating the earth – Boring with explosion in inaccessible hole – With bore condition firing control – or compensating means
Patent

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