4. Pipe joints or couplings
  5. Deformed
  6. Outwardly expanded

John M. Holmberg

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Connection of drill tubes

Pipe joints or couplings – Deformed – Outwardly expanded
Patent

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Thread structure for percussion drill elements

Joints and connections – Distinct end coupler – Separate screw or pin-type connections
Patent

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Profile ID: LFUS-PAI-P-854822

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