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US Patent: 316,912
Lathe-chuck Frictional centering chuck for watch makers
Patentee: William M. Preston (exact or similar names) - Schoharie, NY USPTO Classifications: 279/155, 279/16, 279/49 Tool Categories: trade specific : watchmaker metalworking machines : metal lathes : metal lathe chucks Assignees: None Manufacturer: Not known to have been produced Witnesses: J. Wallace March Ezra Twitchell	Patent Dates: Applied: Nov. 21, 1884 Granted: Apr. 28, 1885 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Steve Gosselin

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