4. Boring or penetrating the earth
  5. Boring without earth removal

Dirk A. Wilson

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Air driven impact operated ground piercing tool

Tool driving or impacting – Impacting devices – Impact transmitting anvil
Patent

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Percussive mole boring device with electronic transmitter

Boring or penetrating the earth – Boring without earth removal
Patent

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Reversible expander

Boring or penetrating the earth – Boring without earth removal
Patent

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Reversible impact-operated boring tool

Tool driving or impacting – Processes
Patent

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Reversible impact-operated boring tool

Metal working – Method of mechanical manufacture – Assembling or joining
Patent

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Profile ID: LFUS-PAI-P-108491

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