4. Boring or penetrating the earth
  5. Boring without earth removal
  6. Fluid passage to exterior of drive point
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Apparatus and method for underground sampling

Boring or penetrating the earth – Boring without earth removal – Fluid passage to exterior of drive point
Patent

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Apparatus for extracting subterranean gas samples

Boring or penetrating the earth – Boring without earth removal – Fluid passage to exterior of drive point
Patent

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Apparatus for improving impact tool lubrication

Boring or penetrating the earth – Boring without earth removal – Fluid passage to exterior of drive point
Patent

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