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US Patent: 1,176,812
Expanding Boring Head and Screwing Head
Patentee: John W. Bradley (exact or similar names) - Leeds, York County, England USPTO Classifications: 408/177 Tool Categories: metalworking machines : drilling and boring : boring heads metalworking machines : drilling and boring : tapping heads and chucks Assignees: None Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Apr. 11, 1913 Granted: Mar. 28, 1916 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens

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