Items
Relation is exactly
U.S. War Dept. Office of Chief Signal Officer
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[E1710AM], Letter from Miller Reese Hutchison to Thomas Alva Edison, Harrison Gilman Thompson, Robert Abraham Bachman, March 16th, 1917 1917-03-16 -
[E1952AK], Letter from Thomas Alva Edison to U.S. Signal Corps, Charles E Coates, April 28th, 1919 1919-04-28