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Alexander Graham Bell | Biography, Education, Telephone, Inventions, & Facts | Britannica
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File:Alexander Graham Bell in Brantford, Ontario, Canada -Melville James Bell, elder brother to Alexander Graham, who's death led to the Bell's emigration to Canada, c.1870.JPG - Wikimedia Commons
Alexander Graham Bell | Biography, Education, Telephone, Inventions, & Facts | Britannica
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CAN YOU HEAR ME NOW? “If I could make a current of electricity vary in intensity precisely as the air varies in density during the production of sound, - ppt download
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