|
BE899466A
|
|
Method and device for performing a direct drilling in subterranean rock formations.
|
|
DE3406364C1
|
|
Method and device for directional drilling in underground rock formations
|
|
DE3403239C1
|
|
Devices for optional straight or directional drilling in underground rock formations
|
|
US4512419A
|
|
Coring device with an improved core sleeve and anti-gripping collar
|
|
US4512423A
|
|
Coring device with an improved weighted core sleeve and anti-gripping collar
|
|
DE3320515C1
|
|
High pressure seal for parts of deep drilling tools that can be moved longitudinally against each other
|
|
US4515227A
|
|
Nozzle placement in a diamond rotating bit including a pilot bit
|
|
US4512426A
|
|
Rotating bits including a plurality of types of preferential cutting elements
|
|
US4499959A
|
|
Tooth configuration for an earth boring bit
|
|
DE3308441C1
|
|
Compensation device for deep drilling tools that can be inserted into a drill string
|
|
US4512425A
|
|
Up-drill sub for use in rotary drilling
|
|
GB8300677D0
|
|
Improvements in diamond drill bits for drilling bore holes in earth formations
|
|
DE3300357A1
|
|
METHOD AND DEVICE FOR THE PRODUCTION OF CUTTING ELEMENTS, ESPECIALLY FOR DEEP DRILL CHISELS
|
|
DE3234003C1
|
|
Locking devices for tools with telescopically displaceable parts
|
|
DE3234027C1
|
|
Device for locking and breaking threaded connections
|
|
DE3233980C1
|
|
Direct drive for deep drill bits based on the Moineau displacement principle
|
|
DE3233982C1
|
|
Auxiliary controlled valve located in a drill string
|
|
DE3142722A1
|
|
MECHANICAL PRUNERS
|
|
US4429741A
|
|
Self powered downhole tool anchor
|
|
GB2083525A
|
|
Oil well tool drive shaft bearing
|
