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PCE
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CPC Subgroup
G11B 3/72

Groove formations, e.g. run-in groove, run-out groove

Full Title

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

2 direct subcodes

Child Classifications

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  • G11B 3/74 Multiple output tracks, e.g. binaural stereophonic
  • G11B 3/76 forming part of cinematograph films