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US Patent: 816,291
Power Hammer
Patentee:
Clarence W. Blackstone - Chicago, Cook County, IL

USPTO Classifications:
72/434, 72/450

Tool Categories:
metalworking machines : power hammers

Assignees:
Clarence W. Blackstone - Chicago, Cook County, IL
Fred H. Knapp - Chicago, Cook County, IL

Manufacturer:
Not known to have been produced

Witnesses:
Unknown

Patent Dates:
Applied: Aug. 08, 1904
Granted: Mar. 27, 1906

Patent Pictures:
USPTO pdf tiff
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