Items
recipient is exactly
U.S. War Dept. Office of Chief Signal Officer
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[MF44AS], Letter from Thomas Alva Edison to Louis M Evans, U.S. War Dept. Office of Chief Signal Officer, August 7th, 1918 1918-08-07 -
[MF44AU], Letter from Thomas Alva Edison to Joseph Oswald Mauborgne, U.S. War Dept. Office of Chief Signal Officer, August 15th, 1918 1918-08-15