Exam (elaborations)
ILE Exam Hearing Aids completed 2022
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ILE Exam Hearing Aids completed 2022Hand 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 1920 large...
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