Gramophone pick-ups using a stylus; Recorders using a stylus

Full Title

Transducers of moving-armature or moving-core type (acoustic diaphragm of magnetisable material directly coacting with electromagnet H04R13/00) > Gramophone pick-ups using a stylus; Recorders using a stylus

Child Classifications

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• H04R 11/10 comprising two or more styli or transducers (H04R11/12 takes precedence)
• H04R 11/12 signals being recorded or played back by vibration of a stylus in two orthogonal directions simultaneously