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  [PT5062], Patent Application, Thomas Alva Edison, August 21st, 1912

  1912-08-21
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  [PT5062A], Legal Testimony, U.S. Patent Office. Examiner, October 5th, 1915

  1915-10-05
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  [PT5062B], Legal Testimony, Frank Lewis Dyer, November 6th, 1915

  1915-11-06
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  [PT5062C], Legal Decision, U.S. Patent Office. Examiners-in-Chief, January 6th, 1916

  1916-01-06