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US Patent: 1,270,667
Rock Drill Sharpener
Patentee: William A. Smith (exact or similar names) - Denver, CO USPTO Classifications: 269/25, 76/5.4 Tool Categories: Assignees: Denver Rock Drill Mfg. Co. - Denver, CO Manufacturer: Not known to have been produced Witnesses: Sullivan V. Johnson Hjalmer C. Gustafson	Patent Dates: Applied: Jun. 13, 1917 Granted: Jun. 25, 1918 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens

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