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kowalskil July 17th, 2015 11:11 PM

Personal Sound Amplifiers (PSA)
Personal Sound Amplifiers (PSA)
Hearing aids are very expensive, typically from $3000 to $6000 a pair..
But some people might postpone wearing them, for many year..
I describe this alternative at my university website:
Feel free to share this short essay with others.
Comments will be appreciated..
Ludwik Kowalski (see Wikipedia)

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