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US Patent: 1,725,515
Method of sharpening hollow or mortiser chisels
Patentees: Adolph H. Hawkinson (exact or similar names) - Rockford, IL Erick W. Peterson (exact or similar names) - Rockford, IL USPTO Classifications: 408/18, 408/1R, 408/229, 408/30, 76/119 Tool Categories: metalworking machines : grinders : sharpening machines Assignees: Greenlee Brothers & Co. - Rockford, IL Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Mar. 19, 1925 Granted: Aug. 20, 1929 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Greenlee Brothers & Co.

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