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US Patent: 5,177,335
Prefilter for EDM machine
Patentees: John D. Hartwig (exact or similar names) - St. Louis, MO Roy W. Ritchey, Jr. (exact or similar names) - Eureka, MO USPTO Classifications: 210/122, 210/400, 219/69.14 Tool Categories: metalworking machines : electrical discharge machining Assignees: Westhoff Machine Co., Inc. - Fenton, MO Manufacturer: Westhoff Machine Co., Inc. - Fenton, MO Witnesses: Unknown	Patent Dates: Applied: Jan. 16, 1990 Granted: Jan. 05, 1993 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Westhoff Machine Co.

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