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US Patent: 202,477
Improvement in wood-boring machines
Patentee:
Thomas O. Selfridge - Washington, DC

USPTO Classifications:
408/110, 408/124, 408/85, 408/86

Tool Categories:
woodworking tools : hand drills : eggbeater drills

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
J. W. Easby
H. A. Goldsborough

Patent Dates:
Applied: Mar. 30, 1878
Granted: Apr. 16, 1878

Patent Pictures:
Selfridge 202,477
USPTO pdf tiff
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Description:
In shape this is a breast drill with a twist. The object of the invention is to cut around the bolts holding decking on a ship. This would allow quicker replacement of the plank. Selfridge, a member of the Navy, shows 4 different cutters to do the job.

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