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Title:
Auger-type drill bit
United States Patent 2578593
Inventors:
Orville, Phipps
Publication Date:
12/11/1951
Assignee:
Orville, Phipps
Primary Class:
Other Classes:
175/323, 175/421, 175/426
International Classes:
E21B10/54
View Patent Images:
Foreign References:
GB375596A
GB409385A
GB472587A
GB500147A
GB518747A
GB528593A