4. Pipe joints or couplings
  5. For branched path
  6. T-type

Drill Systems Inc.

Corporate Assignee

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Double-walled pipe construction

Pipe joints or couplings – For branched path – T-type
Patent

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Method of assembling multiple wall drill pipe

Metal working – Method of mechanical manufacture – Assembling or joining
Patent

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Multi-purpose mobile drill rig

Tool driving or impacting – With vehicle support for drive – Drive structure moved to nonuse position for transport
Patent

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Multiple wall drill pipe

Pipe joints or couplings – With assembly means or feature – Guide and support
Patent

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