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US Patent: 333,662
Auger for cutting square holes
Patentee:
William Patterson (exact or similar names) - San Francisco, CA

USPTO Classifications:
408/30

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

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
A. B. Smith
R. H. Morton
G. C. Knapp

Patent Dates:
Applied: Apr. 20, 1885
Granted: Jan. 05, 1886

Patent Pictures:
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