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US Patent: 1,586,186
Milling Hob
Patentee: Albert W. Erdman (exact or similar names) - Hartford, Hartford County, CT USPTO Classifications: 407/24, 76/115 Tool Categories: metalworking machines : milling machines : milling machine cutters Assignees: Pratt & Whitney Co. - New York, NY Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: May 12, 1923 Granted: May 25, 1926 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Pratt, Whitney & Co.

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