B - Operations – Transporting – 23 – K
Inventor
B - Operations, Transporting
23
K
Inventor
Method and apparatus for seam-welding steel pipes
Method for longitudinally seam-welding pipe-blanks for...
Method for longitudinally welding pipe-blank for welded...
Method for manufacturing spiral-seam-welded steel pipe by...
Method for substantially eliminating residual magnetism in...
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