4. Boring or penetrating the earth
  5. Boring without earth removal
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Variable-length sampling device

Boring or penetrating the earth – Boring without earth removal – Combined with earth removal
Patent

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Vertical percussion ground boring tool apparatus and method

Boring or penetrating the earth – Boring without earth removal
Patent

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Vibratory core drill apparatus for the recovery of soil or sedim

Boring or penetrating the earth – Boring without earth removal – Combined with earth removal
Patent

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