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by Diane Dannenfeldt

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Please copy/paste the following text to properly cite this HowStuffWorks article:

Dannenfeldt, Diane.  "How Hearing Impaired Telephones Work"  13 June 2008.  HowStuffWorks.com. <http://electronics.howstuffworks.com/hearing-impaired-telephones.htm>  11 February 2012.
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Gadgets Deconstructed

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Inside this Article
  1. Introduction to How Hearing-Impaired Telephones Work
  2. How Telephone Amplifiers Work
  3. TTY and TDD Technology
  1. How Relay Services Work
  2. Lots More Information
  3. See all Telephone Technology articles

Lots More Information

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Inside this Article
  1. Introduction to How Hearing-Impaired Telephones Work
  2. How Telephone Amplifiers Work
  3. TTY and TDD Technology
  1. How Relay Services Work
  2. Lots More Information
  3. See all Telephone Technology articles
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