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Creator is exactly
Sperry Gyroscope Co
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[E1468AA1], Letter from Sperry Gyroscope Co, Elmer Ambrose Sperry to Thomas Alva Edison, February 17th, 1914
1914-02-17
[MF02AM], Letter from Elmer Ambrose Sperry, Sperry Gyroscope Co to Thomas Alva Edison, December 16th, 1915
1915-12-16
of 1
1–2 of 2
