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US Patent: 429,807
Power-hammer spring
Patentee:
Philippe Dènéry Dupont - St. Johnsbury, VT

USPTO Classifications:
404/133.1, 72/466.9

Tool Categories:
metalworking machines : drop hammers

Assignees:
None

Manufacturer:
Plessisville Foundry - Plessisville, QC Canada
Dupont Manufacturing Co. - St. Johnsbury, VT
E. & T. Fairbanks & Co. - St. Johnsbury, VT

Witnesses:
A. J. Dutile
J. F. Cassette

Patent Dates:
Applied: Apr. 12, 1890
Granted: Jun. 10, 1890

Patent Pictures:
USPTO pdf tiff
Google Patents
Report data errors or omissions
"Vintage Machinery" entry for E. & T. Fairbanks & Co.
"Vintage Machinery" entry for Dupont Manufacturing Co./St. Johnsbury/VT
"Vintage Machinery" entry for Plessisville Foundry

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