Exam (elaborations)
ILE Exam Hearing Aids(Correctly Answered)2023
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ILE Exam Hearing Aids(Correctly Answered)2023 Hand Cupped Behind Ear >>-first Hearing Aid -increased sound by 5-8db -included horns,trumpets, speaking tubes 1892 >>-carbon amplifiers patent by Alexander Bell -marketed until 1930;first patent for a telephone type hearing instrument...
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