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Letter from Thomas Alva Edison to W G Mach, September 25th, 1875
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Edison, Thomas Alva
Mach, W G
Johnson, B Frank
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Electric pen and mimeograph
Courtesy of Thomas Edison National Historical Park.
Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University
“Letter from Thomas Alva Edison to W G Mach, September 25th, 1875,” Edison Papers Digital Edition, accessed July 18, 2018, http://edison.rutgers.edu/digital/document/LB001029.
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