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US Patent: 2,947,225
Polygonal Hole Forming Tool
Patentee: Leander J. Heppner (exact or similar names) - Chicago, Cook County, IL USPTO Classifications: 29/566, 408/22, 408/30, 409/334, 409/345 Tool Categories: metalworking machines : drilling and boring : drill bits Assignees: None Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Dec. 19, 1958 Granted: Aug. 02, 1960 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens

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