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

Full Title

Piezoelectric transducers; Electrostrictive transducers > 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

Classification Context

Section:

ELECTRICITY

Class:

ELECTRIC COMMUNICATION TECHNIQUE

Subclass:

LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS