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US Patent: 768,113
Self Tightening Tool Holder
Patentee:
Enos S. Costa (exact or similar names) - Quincy, Norfolk County, MA

USPTO Classifications:
279/43.2, 403/21

Tool Categories:
industrial tools : tool holders
stoneworking

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Unknown
Patent Dates:
Applied: Feb. 12, 1904
Granted: Aug. 23, 1904

Patent Pictures:
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