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US Patent: 333,418
Counterboring Attachment for Bits
Patentee:
Edwin Francis Lindsey - Bristol, RI

USPTO Classifications:
408/202

Tool Categories:
woodworking tools : hand drills : drill bits : countersinks
woodworking tools : hand drills : drill accessories

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Leonard G. Simmons
Charles F. Simmons

Patent Dates:
Applied: May 11, 1885
Granted: Dec. 29, 1885

Patent Pictures: [ 1 | 2 ]
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