4. Boring or penetrating the earth
  5. With signaling, indicating, testing or measuring
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Grade monitoring and steering apparatus

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

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Guidance system for drilling boreholes

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

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Gyroscopic steering tool using only a two-axis rate...

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

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