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US Patent: 40,386
Screw Cutting Tap
Patentee:
Caleb C. Walworth (exact or similar names) - Boston, Suffolk County, MA

USPTO Classifications:
408/232

Tool Categories:
metalworking tools : taps and dies

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Unknown
Patent Dates:
Granted: Oct. 20, 1863

Patent Pictures:
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