DIFF Subgroup
B23B 31/4053 Full Title
Chucks ; Expansion mandrels; Adaptations thereof for remote control (faceplates B23Q1/50; rotary devices holding by magnetic and/or electrical force acting directly on work B23Q3/152) > Expansion mandrels
Of 1 combined children, 0 exist in both systems.
1 codes are CPC-only extensions.