signals being recorded or played back by vibration of a stylus in two orthogonal directions simultaneously

Full Title

Piezoelectric transducers; Electrostrictive transducers (piezoelectric or electrostrictive elements in general H10N30/00; details of piezoelectric or electrostrictive motors, generators or positioners ) > Gramophone pick-ups using a stylus; Recorders using a stylus > signals being recorded or played back by vibration of a stylus in two orthogonal directions simultaneously