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US Patent: 493,874
Power Hammer
Patentee:
Joseph O'Brien (exact or similar names) - Boston, Middlesex County, MA

USPTO Classifications:
72/434, 72/445, 72/446

Tool Categories:
metalworking machines : forging machines : power hammers

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Unknown
Patent Dates:
Applied: Feb. 05, 1892
Granted: Mar. 21, 1893

Patent Pictures:
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