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US Patent: 5,337,521
Valve grinder
Patentees: David M. Terpstra (exact or similar names) - Winona, MN Derrick Heyl (exact or similar names) - Rollingstone, MN USPTO Classifications: 279/43, 279/43.7, 279/46.7, 279/50, 451/252, 451/397, 451/430 Tool Categories: trade specific : vehicle repairer : vehicle mechanic : valve and seat maintenance Assignees: Hein-Werner Corp. - Waukesha, WI Manufacturer: Hein-Werner Corp. - Waukesha, WI Witnesses: Unknown	Patent Dates: Applied: Oct. 27, 1992 Granted: Aug. 16, 1994 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Hein-Werner Corp.

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