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Exam (elaborations)

ILE Exam Hearing Aids UPDATED Exam Questions and CORRECT Answers

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Hand Cupped Behind Ear - Ans -first Hearing Aid -increased sound by 5-8db -included horns,trumpets, speaking tubes 1892 - Ans -carbon amplifiers patent by Alexander Bell -marketed until 1930;first patent for a telephone type hearing instrument 1920 - Ans large vacuum tubes; not portable 1938 - Ans miniature vacuum tube ;crystal receivers

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