Alexander Graham Bell
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      • Graphophone
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Graphophone 

Originally know as the phonograph, the graphophone was developed for the interest in recording and producing sound. It was first achieved by Thomas Edison in 1877 but in 1879, Bell and his other assistant Charles Sumner Tainter began to make improvements in Edison's invention. He was interested in this invention because of the potential aid for the teaching of the death. However, they found out later that the tinfoil records used by Edison  was deteriorated after several uses. The overall principle of the graphophone was to record speech vibration onto a disk.  
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