CPC Subgroup
B21D 51/12 objects with corrugated walls
Full Title
Making hollow objects (from thick-walled or non uniform tubes B21K21/00) > characterised by the structure of the objects > objects with corrugated walls
B21D 51/12 Making hollow objects (from thick-walled or non uniform tubes B21K21/00) > characterised by the structure of the objects > objects with corrugated walls