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US Patent: 177,410
Screw Tap
Patentee: Samuel W. Martin (exact or similar names) - Springfield, Clarke County, OH USPTO Classifications: 408/222, 408/233 Tool Categories: metalworking tools : taps and dies Assignees: Samuel W. Martin - Springfield, Clarke County, OH Phineas P. Mast - Springfield, Clarke County, OH Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Apr. 05, 1876 Granted: May 16, 1876 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens

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