The Information Being Derived From Movement Of The Record Carrier, E.g. Using Tachometer {g11b 27/13} Patents (Class G9B/27.022)

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Using mechanical sensing means [n: see provisionally also g9b/27.022] {g11b 27/15} (Class G9B/27.023)
Using electrical sensing means [n: see provisionally also g9b/27.022] {g11b 27/17} (Class G9B/27.024)

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