A kind of diaphragm, vibrating diaphragm and moving-iron receiver
A kind of diaphragm, vibrating diaphragm and moving-iron receiver
- CN 208,386,917 U
- Filed: 07/13/2018
- Issued: 01/15/2019
- Est. Priority Date: 07/13/2018
- Status: Expired
- EN CH
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