4. Boring or penetrating the earth
  5. With tool drive prime mover or above-ground mechanical...
  6. With installing casing
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Deep water drilling with casing

Boring or penetrating the earth – With tool drive prime mover or above-ground mechanical... – With installing casing
Reexamination Certificate

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Device for drilling, in particular percussion drilling or...

Boring or penetrating the earth – With tool drive prime mover or above-ground mechanical... – With installing casing
Reexamination Certificate

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Device for joining threaded rods and tubular casing elements for

Boring or penetrating the earth – With tool drive prime mover or above-ground mechanical... – With installing casing
Patent

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Down hole hammer assembly

Boring or penetrating the earth – With tool drive prime mover or above-ground mechanical... – With installing casing
Patent

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Downhole filter

Boring or penetrating the earth – With tool drive prime mover or above-ground mechanical... – With installing casing
Reexamination Certificate

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Drilling and cementing casing system

Boring or penetrating the earth – With tool drive prime mover or above-ground mechanical... – With installing casing
Reexamination Certificate

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Drilling apparatus

Boring or penetrating the earth – With tool drive prime mover or above-ground mechanical... – With installing casing
Reexamination Certificate

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Drilling with concentric strings of casing

Boring or penetrating the earth – With tool drive prime mover or above-ground mechanical... – With installing casing
Reexamination Certificate

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