4. Boring or penetrating the earth
  5. Boring without earth removal
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Powered soil-sampler

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

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Probe

Boring or penetrating the earth – Boring without earth removal
Patent

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Probing device with microwave transmission

Boring or penetrating the earth – Boring without earth removal
Reexamination Certificate

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Process and apparatus for laying service lines without excavatio

Boring or penetrating the earth – Boring without earth removal – Drive point detached from shaft to form cased bore or with...
Patent

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Process and device for drilling the soil

Boring or penetrating the earth – Boring without earth removal
Patent

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