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ILE Exam Hearing Aids latest solution 2023 100% verified correct
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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 1938 - Miniature vacuum tube; crystal receivers 1930 - Diameter reduced 1940 - Bone conduction receivers were introduced
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