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US Patent: 1,972,316
Process of and apparatus for grinding internal surfaces of tubes
Patentee: Chalmers H. Randolph (exact or similar names) - St. Paul, MN USPTO Classifications: 451/140, 451/303, 451/397, 451/51 Tool Categories: Assignees: Mattison Machine Works - Rockford, IL Manufacturer: Mattison Machine Works - Rockford, IL Witnesses: Unknown	Patent Dates: Applied: Mar. 15, 1933 Granted: Sep. 04, 1934 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Mattison Machine Works

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