4. Hydraulic and earth engineering
  5. Earth treatment or control
  6. Rock or earth bolt or anchor

Peter Andrew Gray

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Hollow bars and method of manufacture

Hydraulic and earth engineering – Earth treatment or control – Rock or earth bolt or anchor
Patent

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Process for forming a threaded member

Metal deforming – By use of tool acting during relative rotation between tool... – During rotation of work
Reexamination Certificate

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Profile ID: LFUS-PAI-P-1360927

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