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http://en.wikipedia.org/wiki/Transmission_(telecommunications)http://en.wikipedia.org/wiki/Binary_numeral_systemhttp://en.wikipedia.org/wiki/Transmission_(telecommunications)http://en.wikipedia.org/wiki/Pavel_Schillinghttp://en.wikipedia.org/wiki/Electromagnetic_telegraphhttp://inventors.about.com/od/cstartinventors/p/ClaudeChappe.htmhttp://inventors.about.com/od/cstartinventors/p/ClaudeChappe.htm

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http://www.durenberger.com/edonbell.mp3http://www.durenberger.com/bell.mp3http://www.durenberger.com/bellephony.mp3http://www.durenberger.com/documents/BELLGRAY.pdf

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http://www.durenberger.com/parisstereo.mp3http://earlyradiohistory.us/index.html

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http://earlyradiohistory.us/index.html

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http://www.durenberger.com/mckinley.mp3

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http://www.durenberger.com/ldviaoperator.mp3http://www.att.com/history/nethistory/switching.html

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http://inventors.about.com/bio/Mary-Bellis-496.htm

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http://www.radiomarine.org/

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http://www.durenberger.com/AROUNDWORLDEDITED1935.mp3http://www.durenberger.com/NYLondon010627.mp3

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http://www.rwonline.com/article/in-search-of-the-truth-about-fessenden/15780http://www.rwonline.com/article/fessenden-world39s-first-broadcaster/15157http://bayarearadio.org/schneider/mccarty.shtml

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http://www.pavekmuseum.org/

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http://durenberger.com/natldefday.mp3

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http://earlyradiohistory.us/index.html

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http://www.durenberger.com/documents/netalert.pdf

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