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US Patent: 721,942
Electric Switch System
Patentee: Adolph L. De Leeuw (exact or similar names) - Hamilton, Butler County, OH USPTO Classifications: 307/38, 361/160 Tool Categories: metalworking machines : machine tool controls Assignees: Niles Tool Works - Hamilton, Butler County, OH Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Nov. 24, 1902 Granted: Mar. 03, 1903 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Niles Tool Works

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