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US Patent: 578,483
Automatic Friction Tapping Attachment
Patentee:
Franklin A. Errington (exact or similar names) - Edgewater, Richmond County, NY

USPTO Classifications:
408/133, 470/103

Tool Categories:
metalworking machines : drilling and boring : tapping heads and chucks

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Unknown
Patent Dates:
Applied: Jul. 21, 1894
Granted: Mar. 09, 1897

Patent Pictures:
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