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US Patent: 390,899
Machine for Corrugating Wrought Metal Tubes
Patentees: Ronello F. Pratt (exact or similar names) - Revere, Suffolk County, MA Charles D. Wainwright (exact or similar names) - Medford, Middlesex County, MA USPTO Classifications: 72/123, 72/78 Tool Categories: specialty machines : tube corrugating machines Assignees: Wainwright Mfg. Co. - Portland, Cumberland County, ME Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Jun. 20, 1887 Granted: Oct. 09, 1888 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens

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