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US Patent: 2,226,226
Counterboring tool Removable pilot for counterbore or reamer
Patentee: Oscar C. Hedin (exact or similar names) - Minneapolis, MN USPTO Classifications: 408/201 Tool Categories: metalworking machines : drilling and boring : drill bits : metalworking countersinks metalworking machines : drilling and boring : drill bits : reamers Assignees: Weldon Tool Co. - Cleveland, OH Manufacturer: Weldon Tool Co. - Cleveland, OH Witnesses: Unknown	Patent Dates: Applied: Oct. 10, 1939 Granted: Dec. 24, 1940 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Weldon Tool Co.

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