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US Patent: 1,745,660
Expanding Arbor
Patentee: William J. Denning (exact or similar names) - Chicago, Cook County, IL USPTO Classifications: 269/52, 279/2.03, 279/2.12, 408/156, 408/171 Tool Categories: metalworking machines : drilling and boring : drill bits : reamers Assignees: Conradson Tool Co. - Chicago, Cook County, IL Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Dec. 06, 1928 Granted: Feb. 04, 1930 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens

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