[n: Using Stationary Discs, Or Cards Provided With A Circular Recording Area (automatic Feed Mechanism Producing A Transducing T Traverse Of The Head Across Stationary Disc Tracks G9b/21.009; Driving Heads Relatively To Stationary Record Carriers For Mechanical Transducing G9b/3.074)] {g11b 25/04s} Patents (Class G9B/25.004)