4. Boring or penetrating the earth
  5. Automatic control
  6. Of boring means including a below-ground drive prime mover

Michael R. Campbell

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Configurable beacon and method

Boring or penetrating the earth – With signaling – indicating – testing or measuring – Tool position direction or inclination measuring or...
Reexamination Certificate

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System and method for tracking and communicating with a...

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

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