ILE Exam Hearing Aids Correct 100%
Hand Cupped Behind Ear - ANSWER -first Hearing Aid -increased sound by 5-8db -included horns,trumpets, speaking tubes 1892 - ANSWER -carbon amplifiers patent by Alexander Bell -marketed until 1930;first patent for a telephone type hearing instrument 1920 - ANSWER large vacuum tubes; not portable
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- May 9, 2024
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ile exam hearing
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ile exam hearing aids correct 100
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hand cupped behind ear answer first hearing ai
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1892 answer carbon amplifiers patent by alexand
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