4. Boring or penetrating the earth
  5. With above-ground means to impact an earth-penetrating means
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Device for controlling the passage of a flushing medium in impac

Boring or penetrating the earth – With above-ground means to impact an earth-penetrating means
Patent

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Device for efficient energy transfer and damping of impact drill

Boring or penetrating the earth – With above-ground means to impact an earth-penetrating means
Patent

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Device for simulataneously casing a hole while drilling

Boring or penetrating the earth – With above-ground means to impact an earth-penetrating means
Reexamination Certificate

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Drilling device for the study and exploitation of the subsoil

Boring or penetrating the earth – With above-ground means to impact an earth-penetrating means
Patent

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Drilling device with an impact-rotation tool

Boring or penetrating the earth – With above-ground means to impact an earth-penetrating means
Patent

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Drilling rig

Boring or penetrating the earth – With above-ground means to impact an earth-penetrating means
Patent

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