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US Patent: 1,688,558
Hollow Mill
Patentee: Ole Severson (exact or similar names) - Shelton, Fairfield County, CT USPTO Classifications: 408/198, 408/203.5 Tool Categories: metalworking machines : milling machines : milling machine cutters Assignees: O. K. Tool Co., Inc. - New York, NY Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Dec. 20, 1924 Granted: Oct. 23, 1928 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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