Graphophone
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The graphophone was an improved version of the phonograph invented by Alexander Graham Bell and Charles S. Tainter. The word graphophone was coined by Bell in 1881 as a joke. The main difference between the two is that the graphophone recorded by horizontal (zig-zag) modulation, while Edison's phonograph used vertical (hill and valley) modulation of the surface. Bell and Tainter's technique was more durable.
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