DIFF Subgroup
G11B 3/72 Groove formations, e.g. run-in groove, run-out groove
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Recording by mechanical cutting, deforming or pressing, e.g. of grooves or pits; Reproducing by mechanical sensing; Record carriers therefor > Record carriers > Groove formations, e.g. run-in groove, run-out groove
CPC:
Recording by mechanical cutting, deforming or pressing, e.g. of grooves or pits; Reproducing by mechanical sensing; Record carriers therefor (G11B11/00, take precedence) > Record carriers > Groove formations, e.g. run-in groove, run-out groove
IPC and CPC are identically structured here. All 2 subcodes exist in both systems.
Child Classifications
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