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US Patent: 429,807
Power-hammer spring
Patentee: Philippe Dènéry Dupont (exact or similar names) - St. Johnsbury, VT USPTO Classifications: 404/133.1, 72/466.9 Tool Categories: metalworking machines : forging machines : drop hammers Assignees: None Manufacturer: Dupont Mfg. Co. - St. Johnsbury, VT Plessisville Foundry - Plessisville, QC Canada E. & T. Fairbanks & Co. - St. Johnsbury, VT Witnesses: J. F. Cassette A. J. Dutile	Patent Dates: Applied: Apr. 12, 1890 Granted: Jun. 10, 1890 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Dupont Mfg. Co. Vintage Machinery entry for Plessisville Foundry Vintage Machinery entry for E. & T. Fairbanks & Co.

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