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US Patent: 627,349
Drop Hammer Operating Means
Patentee: Francis A. Pratt (exact or similar names) - Hartford, Hartford County, CT USPTO Classifications: 72/436, 72/439 Tool Categories: metalworking machines : forging machines : drop hammers Assignees: None Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Oct. 28, 1898 Granted: Jun. 20, 1899 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Pratt, Whitney & Co.

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