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29 November 2016

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http://forums.koplayer.com/posts/t38393-The-first-telephones-were-directly-connected-to-each-other-from-one-customer-s-office-or-residence

https://www.igotbiz.com/forum/products-for-sale/1067-the-transmitter-converts-the-sound-waves-to-elect

http://www.m3forum.net/m3forum/showthread.php?p=1067545866

http://forums.ubi.com/showthread.php/1526492-which-are-sent-through-the-telephone-network-to-the-receiving-phone-Forums

http://www.enworld.org/forum/showthread.php?505754-The-receiving-telephone-converts-the-signals-into-audible-sound-in-the-receiver

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