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US Patent: 3,470,598
Method of making structural elements
Patentee: Viggo Berthelsen (exact or similar names) - Copenhagen, Denmark USPTO Classifications: 228/142, 228/170, 228/174, 264/273, 29/411, 29/417, 29/458, 29/527.1, 29/896.6, 29/897.312, 428/138, 52/309.16 Tool Categories: Assignees: V. Berthelsen Engineering Works, Inc. - Joliet, IL Manufacturer: V. Berthelsen Engineering Works, Inc. - Joliet, IL Witnesses: Unknown	Patent Dates: Applied: May 21, 1965 Granted: Oct. 07, 1969 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Berthelsen Engineering Works

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