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US Patent: 3,844,546
Clamping fixture for a tubular workpiece
Patentee: Donald K. Greenberg (exact or similar names) - Rockford, IL USPTO Classifications: 269/22, 269/287, 269/48.1, 279/158, 279/4.06, 279/46.1 Tool Categories: Assignees: Barnes Drill Co. - Rockford, IL Manufacturer: Barnes Drill Co. - Rockford, IL Witnesses: Unknown	Patent Dates: Applied: Nov. 09, 1973 Granted: Oct. 29, 1974 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Barnes Drill Co.

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