H04R9/12 - CPC Classification

Transducers of moving-coil, moving-strip, or moving-wire type Gramophone pick-ups using a stylus; Recorders using a stylus

• H04R9/14 » comprising two or more styli or transducers 0
• H04R9/16 » signals recorded or played back by vibration of a stylus in two orthogonal directions simultaneously 2

Recent Application in this class: