Exam (elaborations)
ILE Exam Hearing Aids | 82 Questions and Answers.
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ILE Exam Hearing Aids | 82 Questions and Answers. Hand Cupped Behind Ear - Correct answer--first Hearing Aid -increased sound by 5-8db -included horns,trumpets, speaking tubes 1892 - Correct answer--carbon amplifiers patent by Alexander Bell -marketed until 1930;first patent for a telephone t...
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