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US Patent: 2,621,717
Annular Torch Head for Flame Hardening Machines
Patentees: David M. Strauchen (exact or similar names) - Cincinnati, Hamilton County, OH Milton Garvin (exact or similar names) - Cincinnati, Hamilton County, OH USPTO Classifications: 239/132.3, 239/552, 266/261 Tool Categories: specialty machines : flame hardening machines Assignees: Cincinnati Milling Machine Co. - Cincinnati, Hamilton County, OH Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: May 12, 1949 Granted: Dec. 16, 1952 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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