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US Patent: 1,712,876
Wire-Threading Bit
Patentee:
John V. Dolezal - Beeville, TX

USPTO Classifications:
249/213, 249/40, 29/241, 29/433, 408/208, 408/226, 76/DIG.4

Tool Categories:
woodworking tools : hand drills : drill bits : hollow bits

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Unknown

Patent Dates:
Applied: Jun. 16, 1928
Granted: May 14, 1929

Patent Pictures: [ 1 | 2 ]
USPTO pdf tiff
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