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US Patent: 3,308,695
Apparatus for Machining a Helical Element
Patentee: Gilbert H. Hagerman (exact or similar names) - New Carlisle, OH USPTO Classifications: 82/11, 82/110, 82/130 Tool Categories: metalworking machines Assignees: Robbins & Myers, Inc. - Springfield, OH Manufacturer: Not known to have been produced Witnesses: none listed	Patent Dates: Applied: Sep. 16, 1964 Granted: Mar. 14, 1967 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Robbins & Myers, Inc.

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