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:1.Bodanis,D., (2007), ,,.
2.http://en.wikipedia.org/wiki/Alexander_Graham_Bell
3.http://www.aps.org/publications/apsnews/200003/history.cfm4.http://historyoftelephone.blogspot.gr/2007/08/blog-post.html
http://en.wikipedia.org/wiki/Alexander_Graham_Bellhttp://en.wikipedia.org/wiki/Alexander_Graham_Bellhttp://en.wikipedia.org/wiki/Alexander_Graham_Bellhttp://www.aps.org/publications/apsnews/200003/history.cfmhttp://www.aps.org/publications/apsnews/200003/history.cfmhttp://www.aps.org/publications/apsnews/200003/history.cfmhttp://historyoftelephone.blogspot.gr/2007/08/blog-post.htmlhttp://historyoftelephone.blogspot.gr/2007/08/blog-post.htmlhttp://historyoftelephone.blogspot.gr/2007/08/blog-post.htmlhttp://historyoftelephone.blogspot.gr/2007/08/blog-post.htmlhttp://www.aps.org/publications/apsnews/200003/history.cfmhttp://en.wikipedia.org/wiki/Alexander_Graham_Bell
