ROTARY DRILL BITS AND CUTTING ELEMENTS FOR SUCH BITS
A Standard patent application filed on 27 November 1984 credited to Wardley, Michael Thomas
;
Barr, John Denzil
Details
Application number :
35929
Application type :
Standard
Application status :
WITHDRAWN
Under opposition :
No
Proceeding type :
Invention title :
ROTARY DRILL BITS AND CUTTING ELEMENTS FOR SUCH BITS