4. Boring or penetrating the earth
  5. Below-ground impact members

Werner Bongers

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Percussive blow assisted rotary drill

Cutting by use of rotating axially moving tool – Tool or tool with support – Having peripherally spaced cutting edges
Patent

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Rotary percussion blow assisted drill

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

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Profile ID: LFUS-PAI-P-1066225

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