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2. Electret microphone - Wikipedia

   en.wikipedia.org/wiki/Electret_microphone

   An electret microphone is a microphone whose diaphragm forms a capacitor (historically-termed a condenser) that incorporates an electret. The electret's permanent electric dipole provides a constant charge Q on the capacitor.

3. Gerhard M. Sessler - Wikipedia

   en.wikipedia.org/wiki/Gerhard_M._Sessler

   Gerhard M. Sessler (born 15 February 1931 in Rosenfeld, Baden-Württemberg, Germany) [1] is a German inventor and scientist. He is Professor emeritus at the Department of Electrical Engineering and Information Technology of the Technische Universität Darmstadt.

4. James West (inventor) - Wikipedia

   en.wikipedia.org/wiki/James_West_(inventor)

   First patent on foil electret microphone by G. M. Sessler and J. E. West (pages 1 to 3) West was born on February 10, 1931, in Farmville, Prince Edward County, Virginia as the elder of two children to Samuel Edward and Matilda West. He was born in his maternal grandfather's house because the local hospital would not admit Black people.

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6. Microphone - Wikipedia

   en.wikipedia.org/wiki/Microphone

   First patent on foil electret microphone by G. M. Sessler et al. (pages 1 to 3) An electret microphone is a type of condenser microphone invented by Gerhard Sessler and Jim West at Bell laboratories in 1962. [24] The externally applied charge used for a conventional condenser microphone is replaced by a permanent charge in an electret material.

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9. Electret - Wikipedia

   en.wikipedia.org/wiki/Electret

   An electret (formed as a portmanteau of electr-from "electricity" and -et from "magnet") is a dielectric material that has a quasi-permanent electrical polarisation. An electret has internal and external electric fields , and is the electrostatic equivalent of a permanent magnet .