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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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