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US Patent: 221,391
Expandable auger bit
Patentee:
Caleb Brinton - Chicago, IL

USPTO Classifications:
279/83, 408/195

Tool Categories:

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Unknown

Patent Dates:
Granted: Nov. 11, 1879

Patent Pictures:
USPTO pdf tiff
Google Patents
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