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• Microphone
  [[Image:US Patent 3118022 - Gerhard M. Sessler James E. West - Bell labs - electroacustic transducer - foil electret condens ... ... one invented at [[Bell laboratories]] in 1962 by [[Gerhard Sessler]] and [[James Edward Maceo West|Jim West]].<ref>{{cite journal
  51 KB (7651 words) - 17:31, 22 January 2009

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