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US Patent: 816,393
Threading Mechanism for Automatic Screw Machines
Patentee:
Christopher M. Spencer (exact or similar names) - Windsor, Hartford County, CT

USPTO Classifications:
29/37R

Tool Categories:
metalworking machines : screw machines

Assignees:
Universal Machine Screw Co. - Hartford, Hartford County, CT

Manufacturer:
Not known to have been produced

Witnesses:
Unknown
Patent Dates:
Applied: Mar. 02, 1905
Granted: Mar. 27, 1906

Patent Pictures:
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