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PCE
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CPC Subgroup
B21D 51/14

Flattening hollow objects for transport or storage; Re-forming same (making tubes from doubled flat material B21C37/14)

Full Title

Making hollow objects (from thick-walled or non uniform tubes B21K21/00) > characterised by the structure of the objects > Flattening hollow objects for transport or storage; Re-forming same (making tubes from doubled flat material B21C37/14)