DIFF Subgroup
B23B 29/03403 Full Title
Holders for non-rotary cutting tools (B23B27/12 takes precedence); Boring bars or boring heads; Accessories for tool holders > Boring heads > with tools moving radially, e.g. for making chamfers or undercuttings
Of 5 combined children, 0 exist in both systems.
5 codes are CPC-only extensions.