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US Patent: 91,965
Improved machine for forming threads on screws
Patentee:
Treat T. Prosser (exact or similar names) - Chicago, IL

USPTO Classifications:
72/103

Tool Categories:

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
C. F. Clausen
D. P. Holloway
Patent Dates:
Granted: Jun. 29, 1869

Patent Pictures:
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