Examen
ILE Exam Hearing Aids 2022/2023 with 100% correct answers
- Cours
- Établissement
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 1920 large vacuum tubes; not portable 1...
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