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US Patent: 415,846
Screw Tapping Machine
Patentee: Francis H. Richards (exact or similar names) - Hartford, Hartford County, CT USPTO Classifications: 144/24, 408/14, 408/168, 470/203, 470/98 Tool Categories: specialty machines : nut or bolt making machines metalworking machines : metal threading machines Assignees: None Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Feb. 18, 1889 Granted: Nov. 26, 1889 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens

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