4. Boring or penetrating the earth
  5. Common drive or advancing means for concurrently boring...
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Horizontal boring apparatus

Boring or penetrating the earth – Common drive or advancing means for concurrently boring...
Patent

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Multi shaft drilling unit

Boring or penetrating the earth – Common drive or advancing means for concurrently boring...
Patent

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Multi-shaft drilling unit

Boring or penetrating the earth – Common drive or advancing means for concurrently boring...
Patent

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Rotatable drilling head

Boring or penetrating the earth – Common drive or advancing means for concurrently boring...
Patent

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Rotatable drilling head

Boring or penetrating the earth – Common drive or advancing means for concurrently boring...
Patent

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Successive hole boring machine and lost strike preventing device

Boring or penetrating the earth – Common drive or advancing means for concurrently boring...
Patent

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