[PT5022-F]
https://edisondigital.rutgers.edu/folder/PT5022-F
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[PT5022], Patent Application, Thomas Alva Edison, June 8th, 1911
1911-06-08 -
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[PT5022A], Technical Note, Thomas Alva Edison, May 22nd, 1911
1911-05-22 -
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[PT5022B], Technical Note, Thomas Alva Edison, John R Anderson, Jr., May 26th, 1911
1911-05-26