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US Patent: 1,180,680
Apparatus for Controlling Magnetic Chucks
Patentee: Oakley S. Walker (exact or similar names) - Worcester, Worcester County, MA USPTO Classifications: 200/15, 361/145 Tool Categories: metalworking machines : grinders : magnetic chucks work holding : magnetic chucks Assignees: O. S. Walker Co. - Worcester, Worcester County, MA Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Mar. 14, 1914 Granted: Apr. 25, 1916 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for O. S. Walker & Co.

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