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US Patent: 5,170,689
Metal working machine
Patentee: Jim Dvorak (exact or similar names) - Cosmos, MN USPTO Classifications: 83/197, 83/200, 83/515, 83/518, 83/599, 83/609, 83/821, 83/859 Tool Categories: metalworking machines : metal punching machines metalworking machines : metal shearing machines metalworking tools : metal punches Assignees: None Manufacturer: Uni-Hydro Inc. - Cosmos, MN Witnesses: Unknown	Patent Dates: Applied: May 20, 1991 Granted: Dec. 15, 1992 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Uni-Hydro Inc.

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