H04R13/02 - CPC Classification Index

ClassID:

232018 ⎘

H04R13/02 - CPC Classification

Classification description:

Transducers having an acoustic diaphragm of magnetisable material directly co-acting with electromagnet Telephone receivers

Recent Application in this class:

20220078568

Receiver

20140376750

Handset microphone

20130309400

Method for making diaphragm

20110096952

Diaphragm, method making the same and loudspeaker using the same

20060286998

Portable telephone using bone conduction device