4. Boring or penetrating the earth
  5. Processes

Wirth Maschinen- und Bohrgerate-Fabrik GmbH

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Apparatus for extracting cores

Boring or penetrating the earth – With means movable relative to tool to receive – retain – or... – Core-retaining or severing means
Patent

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Device for drilling a bore hole in the ground

Boring or penetrating the earth – Below-ground impact members – Fluid-operated
Patent

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Method and apparatus for modifying the cross-sectional profile o

Hydraulic and earth engineering – Underground passageway – e.g. – tunnel – Boring
Patent

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Method and apparatus for producing a drill hole

Boring or penetrating the earth – Processes
Patent

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Tool member for a rotary drilling tool

Mining or in situ disintegration of hard material – Cutter tooth or tooth head – Tooth mounted on helical head portion or head with helical...
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