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US Patent: 302,520
Trip Hammer
Patentee: Isaac L. Penney (exact or similar names) - Minneapolis, Hennepin County, MN USPTO Classifications: 72/433, 72/446 Tool Categories: metalworking machines : forging machines : drop hammers Assignees: None Manufacturer: O. L. Packard Machinery Co. - Milwaukee, Milwaukee County, WI Witnesses: E. M. Runyan L. Walker Alex Scott Jason W. Grahour	Patent Dates: Applied: Aug. 24, 1883 Granted: Jul. 22, 1884 Patent Pictures: [ 1 | 2 ] USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Packard Machinery Co.

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