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Ile exam stuvia Study guides, Class notes & Summaries

Looking for the best study guides, study notes and summaries about Ile exam stuvia? On this page you'll find 11 study documents about Ile exam stuvia.

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ILE Exam Hearing Aids Solved Correctly

  • ILE Exam Hearing Aids Solved Correctly

  • Exam (elaborations) • 5 pages • 2023
  • Available in package deal
    • ILE Exam Hearing Aids 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 1902-1903 until 1930;first patent for a telephone type hearing instrument 1920 - ANSWER large vacuum tubes; not portable 1938 - ANSWER miniature vacuum tube ;crystal receivers 1930 - ANSWER diameter reduced
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