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Telephone - Wikipedia
Telephone | History, Definition, Invention, Uses, & Facts
Alexander Graham Bell: Telephone & Inventions - HISTORY
History of the telephone - Wikipedia
The Invention and Evolution of the Telephone - ThoughtCo
Alexander Graham Bell | Biography, Education, Telephone, …
How Telephones Work - HowStuffWorks
How do telephones work? - Explain that Stuff
telephone summary | Britannica
History of the telephone in the United States - Wikipedia