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Relation is exactly
Philadelphia Times
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[SC91009B1], Letter from Edison Electric Light Co of Philadelphia, William Dennis Marks to William Henry Wahl, Franklin Institute, February 2nd, 1891
1891-02-02 -
[SC87007A1], Interview, Thomas Alva Edison, December 11th, 1887
1887-12-11 -
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[SC11146A], Interview, Thomas Alva Edison, December 6th, 1911
1911-12-06