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US Patent: 58,134
Improvement in machines for making screws
Patentee: Treat T. Prosser (exact or similar names) - Chicago, IL USPTO Classifications: 72/104 Tool Categories: Assignees: D. H. Wells - Chicago, IL D. Kimbark, Jr. - Chicago, IL J. A. Eastman - Chicago, IL G. W. Gillet - Chicago, IL Treat T. Prosser - Chicago, IL Manufacturer: Not known to have been produced Witnesses: W. C. Dodge P. T. Dodge	Patent Dates: Granted: Sep. 18, 1866 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin
Description: See the biography of the inventor in the description for patent 15,438.

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