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US Patent: 167,834
Centering Device
Patentees: Mark T. Greenwood, (deceased, Estate of) (exact or similar names) - Fitchburg, Worcester County, MA Mary A. Greenwood, Administratrix (exact or similar names) - Fitchburg, Worcester County, MA USPTO Classifications: 33/674 Tool Categories: metalworking machines : metal lathes : metal lathe accessories and attachments Assignees: None Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Mar. 12, 1875 Granted: Sep. 21, 1875 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens

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