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Patent number:
Patent Date:
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:
USPTO
(New site tip)
Google Patents
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