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Personal Sound Amplifiers (Psa)

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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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