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US Patent: 3,474,216
Process Efficiency Detecting Circuit for Electrical Discharge Machining Apparatus
Patentee: John M. Morgan, Jr. (exact or similar names) - Cincinnati, Hamilton County, OH USPTO Classifications: 219/109, 219/69.16, 219/69.2 Tool Categories: metalworking machines : electrical discharge machining metalworking machines : machine tool controls Assignees: Cincinnati Milling Machine Co. - Cincinnati, Hamilton County, OH Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Oct. 19, 1967 Granted: Oct. 21, 1969 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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