4. Boring or penetrating the earth
  5. Boring with explosion in inaccessible hole
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Perforating methods and devices for high wellbore pressure...

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

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Perforating system with shaped charge case having a modified...

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

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Phased perforating guns

Boring or penetrating the earth – Boring with explosion in inaccessible hole – With position orienting or indicating
Patent

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Pipe conveyed explosive with self contained actuation

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

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Positive fire indicator system

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

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Pressure actuated safety switch for oil well perforating

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

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Pressure cycle operated perforating firing head

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

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Pressure responsive perforating and testing system

Boring or penetrating the earth – Boring with explosion in inaccessible hole – With wall engaging packer or anchor
Patent

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Projectile assisted drill for seismic operations

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

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