Items
Relation is exactly
Walker and Kepler
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[D8829AAJ], Letter from Smith (H.B.) Machine Co to Armington and Sims, November 27th, 1888 1888-11-27
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[D9032AAR], Report from Edison Electric Light Co of Philadelphia, William Dennis Marks, June 12th, 1890 1890-06-12
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[D9032AAX], Report from Edison Electric Light Co of Philadelphia, William Dennis Marks, October 15th, 1890 1890-10-15