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US Patent: 54,413
Power Hammer
Improved Atmospheric Hammers
Patentee:
John Robertson (exact or similar names) - New York, NY

USPTO Classifications:
72/450, 74/44, 74/581, 74/600

Tool Categories:
metalworking machines : forging machines : power hammers

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Unknown
Patent Dates:
Granted: May 01, 1866

Patent Pictures:
USPTO (New site tip)
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