4. Boring or penetrating the earth
  5. Cutter element laterally shiftable below ground
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Hole digging apparatus and method

Boring or penetrating the earth – Cutter element laterally shiftable below ground – Cutter element shifted by longitudinally relatively movable...
Patent

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Hydraulic operated underreamer

Boring or penetrating the earth – Cutter element laterally shiftable below ground – Cutter element shifted by fluid pressure
Patent

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