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US Patent: 1,956,364
Expanding Boring Head
Patentee: Ole Severson (exact or similar names) - Shelton, Fairfield County, CT USPTO Classifications: 408/171 Tool Categories: metalworking machines : drilling and boring : boring heads metalworking machines : milling machines : milling machine tools Assignees: O. K. Tool Co., Inc. - New York, NY Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Sep. 22, 1931 Granted: Apr. 24, 1934 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for O. K. Tool Holder Co.

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