Title:
Rock drilling core bit
United States Patent 1996322


Inventors:
Carlson, Anthony E.
Application Number:
US55281331A
Publication Date:
04/02/1935
Filing Date:
07/24/1931
Assignee:
Carlson, Anthony E.
Primary Class:
Other Classes:
175/255, 175/339, 175/345, 175/349, 175/364, 175/408
International Classes:
E21B10/06; E21B10/10; E21B10/20; E21B10/30; E21B17/10
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