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US Patent: 2,967,444
Thread Rolling Machines
Patentees: Elmer E. Hallberg (exact or similar names) - Rockford, Winnebago County, IL Ralph S. Litterst (exact or similar names) - Rockford, Winnebago County, IL USPTO Classifications: 221/237, 72/90 Tool Categories: metalworking machines : metal threading machines : thread rolling machines Assignees: Rockford Machine Tool Co. - Rockford, Winnebago County, IL Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Jun. 03, 1955 Granted: Jan. 10, 1961 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Rockford Machine Tool Co.

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