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US Patent: 57,966
Improvement in screws
Patentee: Treat T. Prosser (exact or similar names) - Chicago, IL USPTO Classifications: 411/423, 411/425 Tool Categories: Assignees: G. W. Gillett - Unknown, Unknown J. A. Eastman - Unknown, Unknown D. W. Wells - Unknown, Unknown D. A. Kimbark - Unknown, Unknown Treat T. Prosser - Chicago, IL Manufacturer: Not known to have been produced Witnesses: H. H. Evarts P. A. Hoyne	Patent Dates: Granted: Sep. 11, 1866 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin

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