4. Boring or penetrating the earth
  5. With signaling, indicating, testing or measuring
  6. Tool position direction or inclination measuring or...

Hédi Sellami

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Method and device for rotary well drilling

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

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Self-penetrating drilling method and thrust-generating tool...

Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Reexamination Certificate

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Profile ID: LFUS-PAI-P-2726162

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