Down-the-hole drilling machine
A Standard patent application filed on 30 March 1993 credited to Ekwall, Berndt
;
Peterson, Martin
;
Jakobsson, Torbjorn
Details
Application number :
35592
Application type :
Standard
Application status :
SEALED
Under opposition :
No
Proceeding type :
Invention title :
Down-the-hole drilling machine
Inventor :
Ekwall, Berndt
;
Peterson, Martin
;
Jakobsson, Torbjorn