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US Patent: 454,197
Screw Thread Cutting Machine
Patentees: Elzie Ament (exact or similar names) - Rogers Park, Cook County, IL Herbert L. Ament (exact or similar names) - Rogers Park, Cook County, IL USPTO Classifications: 408/156, 408/172 Tool Categories: metalworking machines : metal threading machines Assignees: None Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Feb. 25, 1890 Granted: Jun. 16, 1891 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens

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