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US Patent: 672,552
Shaft-upsetting hammer
Patentee: John P. Harrington (exact or similar names) - Philadelphia, PA USPTO Classifications: 72/412 Tool Categories: metalworking machines : forging machines : drop hammers metalworking machines : forging machines Assignees: None Manufacturer: Not known to have been produced Witnesses: E. S. Rockafellar John S. Rilling	Patent Dates: Applied: Dec. 21, 1900 Granted: Apr. 23, 1901 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin

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