Exam (elaborations)
ILE Exam Hearing Aids Answered Questions, Graded A+
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ILE Exam Hearing Aids Answered Questions, Graded A+ 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 19...
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