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US Patent: 1,760,493
Portable Grinding Tool
Patentee: Ernest A. Hall (exact or similar names) - Toledo, Lucas County, OH USPTO Classifications: 24/27 Tool Categories: specialty tools : valve grinding tools Assignees: Hall Manufacturing Co. - Toledo, Lucas County, OH Manufacturer: Hall Manufacturing Co. - Toledo, Lucas County, OH Witnesses: Unknown	Patent Dates: Applied: Jul. 20, 1927 Granted: May 27, 1930 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Hall Manufacturing Co.

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