4. Boring or penetrating the earth
  5. Boring with explosion in inaccessible hole
  6. Firing control mechanically actuated in bore
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Percussion core gun construction and cable arrangement

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

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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 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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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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