A device for drilling holes in the crust of the earth, especially for drilling oil wells
A Standard patent application filed on 13 December 1993 credited to Vestavik, Ola Michael
Details
Application number :
57209
Application type :
Standard
Application status :
LAPSED
Under opposition :
No
Proceeding type :
Invention title :
A device for drilling holes in the crust of the earth, especially for drilling oil wells