4. Boring or penetrating the earth
  5. Automatic control
  6. Of boring means including a below-ground drive prime mover
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Fluid flow restrictor valve for a drill hole coring tool

Boring or penetrating the earth – Automatic control – Of boring means including a below-ground drive prime mover
Patent

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Fluid pressure actuated by-pass and relief valve

Boring or penetrating the earth – Automatic control – Of boring means including a below-ground drive prime mover
Patent

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Fluid pressure actuated bypass and pressure indicating relief va

Boring or penetrating the earth – Automatic control – Of boring means including a below-ground drive prime mover
Patent

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