DIFF Subgroup
B21B 27/021 Full Title
Rolls, (shape of working surfaces required by special processes B21B1/00); Lubricating, cooling or heating rolls while in use > Shape or construction of rolls (for rolling metal of indefinite length in repetitive shapes specially designed for the manufacture of particular objects B21H8/02 )
Of 1 combined children, 0 exist in both systems.
1 codes are CPC-only extensions.
Note: 1 CPC extensions are marked as secondary classification only.