DIFF Subgroup
G11B 27/26 by photoelectric detection, e.g. of sprocket holes
Introduced: September 1968
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 sensing features on the record carrier other than the transducing track > by photoelectric detection, e.g. of sprocket holes
No child classifications to compare. This is a leaf node in both IPC and CPC.