4. Boring or penetrating the earth
  5. With signaling, indicating, testing or measuring
  6. Tool position direction or inclination measuring or...
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Apparatus for measuring weight and torque on drill bit...

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

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Apparatus to measure the earth&apos;s local gravity and...

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

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Auger drill directional control system

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

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Azimuth measuring method for non-vertical drilling

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

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