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US Patent: 3,195,374
Method of making an electrically insulated joint
Patentee: Harland H. Coffin (exact or similar names) - Bridgeport, CT USPTO Classifications: 174/138D, 76/107.1 Tool Categories: trade specific : tool and die maker metalworking machines : metalworking presses : punch presses : dies for punch presses metalworking machines : electrical discharge machining Assignees: Producto Machine Co. - Bridgeport, CT Manufacturer: Producto Machine Co. - Bridgeport, CT Witnesses: Unknown	Patent Dates: Applied: Nov. 17, 1960 Granted: Jul. 20, 1965 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Producto Machine Co.

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