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US Patent: 774,134
Tool Holder for Grindstones
Patentee: Silas L. Derby (exact or similar names) - Frewsburg, Chautauqua County, NY USPTO Classifications: 451/213 Tool Categories: industrial tools : tool holders metalworking machines : grinders Assignees: None Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: May 31, 1904 Granted: Nov. 01, 1904 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens

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