4. Boring or penetrating the earth
  5. Bit or bit element
  6. Rolling cutter bit or rolling cutter bit element

Shuichi Ajiro

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Cutter head for pit-boring machine

Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Patent

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Cylindrical telescopic kelly-bar apparatus

Rotary shafts – gudgeons – housings – and flexible couplings for ro – Coupling facilitates relative axial motion between coupled... – Coupling between rotary drive table and axially movable...
Patent

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Shaft drilling rig

Boring or penetrating the earth – With orienting or racking means for unconnected tools or...
Patent

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Profile ID: LFUS-PAI-P-1037063

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