Edison and his phonograph

Edison had invented phonograph, a precursor to modern day music player and phone, but he not could get the proper utility value of his invention immediately. I came across this paragraph in a book called, "Guns, Germs and Steel" and felt compelled to note it down.

https://dl.dropbox.com/s/gnzzpjc9n82nfwp/Screenshot%202018-04-16%2013.57.59.png?dl=0

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