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US Patent: 269,153
Thread Cutting Die
Patentee:
Frank Armstrong (exact or similar names) - Bridgeport, Fairfield County, CT

USPTO Classifications:
408/221, 408/233, 470/187, 76/117

Tool Categories:
metalworking tools : taps and dies

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Unknown
Patent Dates:
Applied: Sep. 07, 1881
Granted: Dec. 12, 1882

Patent Pictures:
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