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US Patent: 151,522
Machines for Nicking Metal Screws
Patentee:
Charles F. Twichell (exact or similar names) - Worcester, Worcester County, MA

USPTO Classifications:
470/60

Tool Categories:
metalworking machines : screw machines

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Unknown
Patent Dates:
Applied: Dec. 15, 1873
Granted: Jun. 02, 1874

Patent Pictures:
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