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US Patent: 2,220,002
Heat Treating
Patentees: Martin Rollman (exact or similar names) - Cincinnati, Hamilton County, OH William A. Maddox (exact or similar names) - Cincinnati, Hamilton County, OH Henry M. S. Binns (exact or similar names) - Cincinnati, Hamilton County, OH USPTO Classifications: 266/121, 266/127, 266/87 Tool Categories: specialty machines : flame hardening machines specialty machines : heat treating machines Assignees: Cincinnati Milling Machine Co. - Cincinnati, Hamilton County, OH Manufacturer: Cincinnati Lathe & Tool Co. - Cincinnati, Hamilton County, OH Witnesses: Unknown	Patent Dates: Applied: May 17, 1939 Granted: Oct. 29, 1940 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.
Description: This patent number was seen on a Cincinnati Milling Machine Co. patent plate.

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