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A hearing aid is an electro-acoustic device which typically fits in or behind the ear of the wearer, and is to amplify and rectify sound for the wearer. Earlier devices, known as "Trumpets to the ear" or “Horns to the Ear” were rare funnel-like projection cones designed to gather sound energy and direct it into the ear canal. For more info visit here: http://valuehearing.com.au
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