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US Patent: 2,010,759
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Patentee: Ernest A. Hall (exact or similar names) - Toledo, Lucas County, OH USPTO Classifications: 254/42 Tool Categories: specialty tools : valve grinding tools trade specific : vehicle repairer : vehicle mechanic : valve and seat maintenance Assignees: Hall Manufacturing Co. - Toledo, Lucas County, OH Manufacturer: Hall Manufacturing Co. - Toledo, Lucas County, OH Witnesses: Unknown	Patent Dates: Applied: Jul. 14, 1932 Granted: Aug. 06, 1935 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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