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CA Patent: CA-669
Improvements in expansion drills
Patentee:
James Leyden - Winchester, ON Canada

USPTO Classifications:

Tool Categories:
woodworking tools : hand drills : drill bits
woodworking machines : wood drilling and boring : wood drill bits
metalworking machines : drilling and boring : drill bits

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Unknown

Patent Dates:
Granted: Oct. 22, 1870

Patent Pictures:
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