4. Pipe joints or couplings
  5. Particular interface

Karl-Axel Stjernstrom

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Drill tube for use in upward rock drilling

Boring or penetrating the earth – With above-ground means for handling drilling fluid or cutting – With valve
Patent

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Drilling tool for percussive and rotary drilling

Boring or penetrating the earth – Bit or bit element – Bit with leading portion forming smaller diameter initial bore
Patent

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Thread coupling for drill string elements for percussive drillin

Pipe joints or couplings – Particular interface
Patent

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Profile ID: LFUS-PAI-P-44945

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