"Invention: Electric Guitar". www.invention.si.edu. Lemelson Center for the Study of Invention and Innovation. Archived from the original on 24 August 2018. Retrieved 21 July 2018.
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"Invention: Electric Guitar". www.invention.si.edu. Lemelson Center for the Study of Invention and Innovation. Archived from the original on 24 August 2018. Retrieved 21 July 2018.