[n: With Different Data Track Configurations (longitudinal Control Tracks With Transverse User Data Tracks G9b/20.02)] [n9607] {g11b 20/12b6} Patents (Class G9B/20.023)

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[n: for continuous data, e.g. digitised analog information signals, pulse code modulated (pcm) data] [n9607] {g11b 20/12b6c} (Class G9B/20.024)

[n: for discontinuous data, e.g. digital information signals, computer programme data] [n9607] {g11b 20/12b6d} (Class G9B/20.025)

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