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Patents for Byron Sprague
Patents 1 - 2 of 2
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NumberDatePatenteeTitleType
42,216Apr. 05, 1864W.T. NicholsonImprovement in File Cutting Machinestool making machines
42,217Apr. 05, 1864W.T. NicholsonImprovement in File Cutting Machinestool making machines
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