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US Patent: 94,955
Improved compound for emery-wheels and oil-stones
Patentees: N. B. Hadley (exact or similar names) - Northampton, MA R. J. Costain (exact or similar names) - Northampton, MA USPTO Classifications: 51/301, 51/309 Tool Categories: Assignees: None Manufacturer: Hadley & Costain - Providence, RI Diamond Emery Wheel & Machine Co. - Providence, RI Witnesses: James R. Hadley Benjamin J. Ward	Patent Dates: Granted: Sep. 21, 1869 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Diamond Machine Co. Vintage Machinery entry for J. M. Marston & Co.

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