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US Patent: 433,334
Screw Cutting Die
Patentee:
Gustav L. Engren - Brooklyn, NY

USPTO Classifications:
408/215

Tool Categories:
industrial tools : taps and dies

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Unknown

Patent Dates:
Applied: Nov. 12, 1889
Granted: Jul. 29, 1890

Patent Pictures:
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