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US Patent: 91,117
Improvement in machines for threading screws
Patentee:
Nicholas B. Hadley - Providence, RI

USPTO Classifications:
173/144

Tool Categories:
metalworking machines : screw machines

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
William E. Turner
William B. Hale

Patent Dates:
Granted: Jun. 08, 1869

Patent Pictures:
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