4. Boring or penetrating the earth
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Fitting for controlled trajectory drilling, comprising a variabl

Boring or penetrating the earth – Means traveling with tool to constrain tool to bore along... – Sectional guide or shaft having means to lock sections in...
Patent

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Fitting for controlled trajectory drilling, comprising a variabl

Boring or penetrating the earth – Means traveling with tool to constrain tool to bore along... – Sectional guide or shaft having means to lock sections in...
Patent

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Flexible centralizer

Boring or penetrating the earth – Means traveling with tool to constrain tool to bore along...
Patent

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Flexible directional drilling apparatus and method

Boring or penetrating the earth – Means traveling with tool to constrain tool to bore along... – Axially spaced opposed bore wall engaging guides
Reexamination Certificate

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Flexible drill pipe

Boring or penetrating the earth – Means traveling with tool to constrain tool to bore along... – Sectional guide or shaft having means to lock sections in...
Patent

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Flexible tunneling apparatus and method

Boring or penetrating the earth – Means traveling with tool to constrain tool to bore along... – Sectional guide or shaft having means to lock sections in...
Patent

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Fluid powered stepping motor for rotating a downhole assembly re

Boring or penetrating the earth – Means traveling with tool to constrain tool to bore along...
Patent

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