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US Patent: 167,527
Improvement in molds for forming artificial grindstones
Patentee: Gilbert Hart (exact or similar names) - Detroit, MI USPTO Classifications: 249/112, 249/146, 249/166 Tool Categories: industrial tools : grinding wheels metalworking machines : grinders : sharpening machines : grinding wheels Assignees: None Manufacturer: Not known to have been produced Witnesses: G. L. Howard George Scott	Patent Dates: Applied: Mar. 13, 1875 Granted: Sep. 07, 1875 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin

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