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US Patent: 630,712
Tool for Cutting Screw Threads
Patentee: Charles A. Johnson (exact or similar names) - Unionville, Hartford County, CT USPTO Classifications: 408/159, 408/74 Tool Categories: metalworking tools : taps and dies metalworking tools : tap and die holders Assignees: None Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Sep. 12, 1898 Granted: Aug. 08, 1899 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens

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