by rollers

Full Title

Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts (straightening of well casings in situ E21B; ) > by rollers

Child Classifications

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• B21D 3/04 arranged on axes skew to the path of the work
• B21D 3/05 arranged on axes rectangular to the path of the work
• B21D 3/06 arranged inclined to a revolving flier rolling frame
• B21D 3/08 which move in an orbit without rotating round the work