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Spear, Ellis
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[QCB09129], Legal Testimony, U.S. Patent Office. Commissioner, Ellis Spear, June 13th, 1877
1877-06-13
[TI2031A], Letter from U.S. Patent Office, Henry Clark Townsend, Ellis Spear to Thomas Alva Edison, March 26th, 1878
1878-03-26
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