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US Patent: 504,000
Machine for Grinding Thread Cutting Tools
Patentees: Charles P. R. Thiel (exact or similar names) - Lawrence, Essex County, MA Max M. Aust (exact or similar names) - Lawrence, Essex County, MA USPTO Classifications: 451/273, 451/369, 451/460 Tool Categories: metalworking machines : grinders : tool grinders Assignees: None Manufacturer: Not known to have been produced Witnesses: Henry W. Williams J. M. Hartnett	Patent Dates: Applied: May 27, 1893 Granted: Aug. 29, 1893 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens

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