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US Patent: 285,387
Power Hammer
Patentee:
John C. Butterfield (exact or similar names) - Chicago, Cook County, IL

USPTO Classifications:
72/431

Tool Categories:
metalworking machines : forging machines : power hammers

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Unknown
Patent Dates:
Applied: May 01, 1881
Granted: Sep. 25, 1883

Patent Pictures:
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