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US Patent: 642,309
Automatically Opening or Closing Die for Cutting Screw Threads, &c.
Patentee:
Franklin A. Errington (exact or similar names) - New York, NY

USPTO Classifications:
408/74, 470/46, 470/74

Tool Categories:
metalworking tools : taps and dies
metalworking tools : tap and die holders

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Unknown

Patent Dates:
Applied: Jul. 24, 1897
Granted: Jan. 30, 1900

Patent Pictures:
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