4. Boring or penetrating the earth
  5. Boring without earth removal
  6. Combined with earth removal

Robert W. Sundquist

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Coring bit and method for obtaining a material core sample

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

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Coring bit motor and method for obtaining a material core...

Boring or penetrating the earth – Automatic control – Of boring means including a below-ground drive prime mover
Reexamination Certificate

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Method and apparatus for retaining a core sample within a...

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

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Profile ID: LFUS-PAI-P-2455226

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