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US Patent: 477,159
Power Hammer
Patentees: James B. Sweeney (exact or similar names) - St. Johnsbury, Caledonia County, VT Robert B. Laird (exact or similar names) - St. Johnsbury, Caledonia County, VT USPTO Classifications: 72/450, 74/25 Tool Categories: metalworking machines : forging machines trade specific : blacksmith Assignees: None Manufacturer: Laird & Sweeney Mfg. Co. - St. Johnsbury, Caledonia County, VT Witnesses: Frank Stafford Wendell P. Stafford Charles Nider C. Sedgwick	Patent Dates: Applied: Jul. 21, 1891 Granted: Jun. 14, 1892 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Laird & Sweeney Mfg. Co.

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