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US Patent: 2,188,251
Preload adjustment for ball bearings
Patentee: James Holly Nelson (exact or similar names) - Racine, WI USPTO Classifications: 384/517, 384/519 Tool Categories: metalworking machines : grinders Assignees: Dumore Co. - Racine, WI Manufacturer: Dumore Co. - Racine, WI Witnesses: Unknown	Patent Dates: Applied: Oct. 28, 1938 Granted: Jan. 23, 1940 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Dumore Co.
Description: This patent number has been seen on a Dumore model 44-011 toolpost grinder.

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