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US Patent: 908,872
Ball bearing
Patentee: George O. Leopold (exact or similar names) - Philadelphia, PA USPTO Classifications: 16/DIG.27, 384/609, 54/7 Tool Categories: Assignees: North Brothers Manufacturing Co. - Philadelphia, PA Manufacturer: Not known to have been produced Witnesses: Wm. A. Barr Jos. H. Klein	Patent Dates: Applied: Mar. 12, 1908 Granted: Jan. 05, 1909 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Russ Allen "Vintage Machinery" entry for North Bros. Manufacturing Co.

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