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http://www.soc.duke.edu/~s142tm01/history2.html
Released after cylinders, causing cylinders to become outdated. Also known as Vinyl records. -
Made it possible for electricity currents to flow in one direction. Producing the ideo of electric recording. http://www.soc.duke.edu/~s142tm01/history2.html
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http://en.wikipedia.org/wiki/Gramophone_record
Amplifying it with vacuum tubes, then using the amplified signal to drive an electromagnetic recording head. -
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