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US Patent: 2,331,967
Calculating Device
Patentees: Hans Ernst (exact or similar names) - Cincinnati, Hamilton County, OH Raymond D. Wortendyke (exact or similar names) - Cincinnati, Hamilton County, OH USPTO Classifications: 235/84 Tool Categories: Assignees: Cincinnati Milling Machine Co. - Cincinnati, Hamilton County, OH Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Sep. 08, 1941 Granted: Oct. 19, 1943 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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