4. Boring or penetrating the earth
  5. Tool shaft advanced relative to guide insertable in...
  6. Tool telescopes over guide having surface set at angle in hole
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Apparatus for deflecting a drill string

Boring or penetrating the earth – Tool shaft advanced relative to guide insertable in... – Tool telescopes over guide having surface set at angle in hole
Patent

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Apparatus for directional coring

Boring or penetrating the earth – Tool shaft advanced relative to guide insertable in... – Tool telescopes over guide having surface set at angle in hole
Patent

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