4. Boring or penetrating the earth
  5. Processes

Willi Steufmehl

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Method and apparatus for modifying the cross-sectional profile o

Hydraulic and earth engineering – Underground passageway – e.g. – tunnel – Boring
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Method and apparatus for producing a drill hole

Boring or penetrating the earth – Processes
Patent

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Profile ID: LFUS-PAI-P-709069

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