4. Boring or penetrating the earth
  5. Tool shaft advanced relative to guide insertable in...
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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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Apparatus for drilling lateral drainholes from a wellbore

Boring or penetrating the earth – Tool shaft advanced relative to guide insertable in... – With anchor for guide engaging hole side wall
Reexamination Certificate

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Apparatus for lateral drain hole drilling in oil and gas wells

Boring or penetrating the earth – Tool shaft advanced relative to guide insertable in...
Patent

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Apparatus for making boreholes in the lateral walls of narrow un

Boring or penetrating the earth – Tool shaft advanced relative to guide insertable in...
Patent

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