Who manufactures the hearing aid chips?

[KG]

Could someone inform us who are the largest designers and or manufactures of
hearing aid chips and for what brands?

 

[William Sommerwerck]

Go to a library. There are books listing virtually any product or service
you might want. I forget the name, but I think they're blue.

 

[KG]

God, it appeared like such a simple question. Thank you all who replied.