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US Patent: 900,044
Hollow Auger
Patentee:
Nils E. Swanson (exact or similar names) - Denver, CO

USPTO Classifications:
175/421, 408/206

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

Assignees:
Nils E. Swanson - Denver, CO
Robert F. Ohlin - Denver, CO

Manufacturer:
Not known to have been produced

Witnesses:
A. J. O'Brien
Robert F. Ohlin

Patent Dates:
Applied: Jun. 10, 1907
Granted: Sep. 29, 1908

Patent Pictures:
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