DIFF Subgroup
G11B 27/327 Full Title
Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel > Indexing; Addressing; Timing or synchronising; Measuring tape travel > by using information detectable on the record carrier > by using information signals recorded by the same method as the main recording > on separate auxiliary tracks of the same or an auxiliary record carrier
Of 2 combined children, 0 exist in both systems.
2 codes are CPC-only extensions.