characterised by the structure of the objects

Full Title

Making hollow objects (from thick-walled or non uniform tubes B21K21/00) > characterised by the structure of the objects

Child Classifications

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• B21D 51/04 built-up objects, e.g. objects with rigidly-attached bottom or cover
• B21D 51/06 folded objects
• B21D 51/08 ball-shaped objects
• B21D 51/10 conically or cylindrically shaped objects
• B21D 51/12 objects with corrugated walls
• B21D 51/14 Flattening hollow objects for transport or storage; Re-forming same (making tubes from doubled flat material B21C37/14)