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US Patent: 3,206,639
Electrical Discharge Machining Apparatus
Patentee: Robert L. Henry (exact or similar names) - Cincinnati, Hamilton County, OH USPTO Classifications: 315/207, 315/227A, 315/289 Tool Categories: metalworking machines : electrical discharge machining Assignees: Cincinnati Milling Machine Co. - Cincinnati, Hamilton County, OH Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Jul. 23, 1962 Granted: Sep. 14, 1965 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Cincinnati Milling Machine Co.

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