4. Boring or penetrating the earth
  5. Boring without earth removal
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High frequency vibratory systems for earth boring

Boring or penetrating the earth – Boring without earth removal
Patent

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Hole-making device

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

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Hollow pole driver

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

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Hydraulically operated subsoil displacement apparatus

Boring or penetrating the earth – Boring without earth removal
Patent

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