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Heysinger, Isaac W
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[QP037186], Legal Testimony, Jonas Walter Aylsworth, March 18th, 1907
1907-03-18 -
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[PT5058], Patent Application, Thomas Alva Edison, July 15th, 1912
1912-07-15 -
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[PT032AFM], Patent Application, Thomas Alva Edison, June 4th, 1902
1902-06-04 -
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[PT032AFL1], Legal Testimony, Dyer Edmonds and Dyer, Thomas Alva Edison, January 31st, 1903
1903-01-31 -
[D9050AEF], Letter from Dyer and Seely to Thomas Alva Edison, November 1st, 1890
1890-11-01