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US Patent: 91,117
Improvement in machines for threading screws
Patentee: Nicholas B. Hadley (exact or similar names) - Providence, RI USPTO Classifications: 173/144 Tool Categories: metalworking machines : screw machines Assignees: None Manufacturer: Not known to have been produced Witnesses: William B. Hale William E. Turner	Patent Dates: Granted: Jun. 08, 1869 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin

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