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When were hearing aids invented?

Yeah, they're aren't much additional details. The question is pretty self explanitory. So, when were hearing aids invented? When did people actually begin to use them if they had trouble hearing? Thanks a ton!

Public Comments

1. All the details you need are at the source I listed, I believe. It was actually interesting finding that out for myself! Basically, Girolama Cardano discovered in 1551 that sound could be transmitted through what would later be a hearing device! I certainly hope that helped!
2. http://www.answers.com/when%20were%20hearing%20aids%20invented%3F