Carbon microphone (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Carbon microphone" in English language version.

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angloconcertina.org

books.google.com

  • Paul J. Nahin (2002). Oliver Heaviside: The Life, Work, and Times of an Electrical Genius of the Victorian Age. JHU Press. p. 67. ISBN 9780801869099.

britannica.com

headset-plus.com

ieeeghn.org

invent.org

microphone-data.com

patents.google.com

pipex.com

aqpl43.dsl.pipex.com

shure.com

pubs.shure.com

shure.com

web.archive.org