4. Wells
  5. Means for perforating, weakening, bending or separating pipe...
  6. Cutter rotates circumferentially of pipe

Masaru Yamakawa

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Boring device for lining material in branched portions of lined

Wells – Means for perforating – weakening – bending or separating pipe... – Cutter rotates circumferentially of pipe
Patent

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Method of constructing information correspondence pipe,...

Hydraulic and earth engineering – Subterranean or submarine pipe or cable laying – retrieving,... – Moving cable within pipe
Reexamination Certificate

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Profile ID: LFUS-PAI-P-1360109

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