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US Patent: 434,060
Machine for Corrugating Tubes
Patentees: John S. Hansen (exact or similar names) - Medford, Middlesex County, MA Charles D. Wainwright (exact or similar names) - Medford, Middlesex County, MA USPTO Classifications: 72/103, 72/95 Tool Categories: specialty machines : tube corrugating machines Assignees: Wainwright Mfg. Co. - Boston, Suffolk County, MA Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Mar. 30, 1889 Granted: Aug. 12, 1890 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens

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