DIFF Subgroup Additional Only
B21B 2023/005 Full Title
Tube-rolling not restricted to methods provided for in only one of groups B21B17/00, B21B19/00, B21B21/00, e.g. combined processes (B21B25/00 takes precedence)
B21B 2023/005 Tube-rolling not restricted to methods provided for in only one of groups B21B17/00, B21B19/00, B21B21/00, e.g. combined processes (B21B25/00 takes precedence)