4. Boring or penetrating the earth
  5. Boring without earth removal
  6. Combined with earth removal
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Earth boring method and apparatus

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

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Excavating tool

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

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Expendable protective sleeve and method of use for soil and grou

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

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Extended soil sampling head

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

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Externally vented drive head with solid center

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

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