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US Patent: 3,141,349
Ball Bearing Screw and Nut Mechanism
Patentee: David I. McDonald (exact or similar names) - Cincinnati, Hamilton County, OH USPTO Classifications: 74/441, 74/89.42 Tool Categories: metalworking machines : metalworking machine mechanisms Assignees: Cincinnati Milling Machine Co. - Cincinnati, Hamilton County, OH Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Sep. 17, 1962 Granted: Jul. 21, 1964 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Cincinnati Milling Machine Co.

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