4. Boring or penetrating the earth
  5. Boring without earth removal
  6. Drive point detached from shaft to form cased bore or with...
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Apparatus and method for drilling with casing

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

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Apparatus for making earth bores

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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