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US Patent: 501,547
Shaping and Spinning Metals by Electricity
Patentee: Elihu Thomson (exact or similar names) - Swampscott, Essex County, MA USPTO Classifications: 219/149, 29/898.054, 29/DIG.43, 86/51 Tool Categories: metalworking machines : electrical discharge machining Assignees: Thomson Electric Welding Co. - Lynn, Essex County, MA Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Jan. 08, 1891 Granted: Jul. 18, 1893 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens

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