Down hole drill having both percussion and rotation devices at the lower end of the drill string
A Standard patent application filed on 28 January 1987 credited to Paul, David William
;
Williams, David Stanley
Details
Application number :
68073
Application type :
Standard
Application status :
LAPSED
Under opposition :
No
Proceeding type :
Invention title :
Down hole drill having both percussion and rotation devices at the lower end of the drill string
Inventor :
Paul, David William
;
Williams, David Stanley
Agent name :
Griffith Hack
Address for service :
GPO Box 1285 MELBOURNE VIC 3001
Filing date :
28 January 1987
Associated companies :
Applicant name :
Boart International Limited
Applicant address :
Boart Place, Oxford Park, Sandton, Transvall, South Africa.