Alexander+Graham+Bell+and+the+History+of+the+Telephone

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History on the Line: Who Invented the Telephone? ThoughtCo. (November 6, 2017)

A Visual History of the Telephone, Slate.com

The History of the Telephone, CNET

History of the Telephone Timeline

Most US Households Have Given Up Landlines for Cellphones, The Verge (May 4, 2017)