197845 ⎘
Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor; Disposition or mounting of heads relative to record carriers with simultaneous movement of head and record carrier, e.g. rotation of head; Disposition or mounting of heads on rotating support; Disposition of more than one recording or reproducing head on support rotating cyclically around an axis perpendicular to the direction of movement of the tape, e.g. for longitudinal scanning with all the heads disposed in a plane substantially parallel to the plane of the tape, e.g. for circular scanning