Make up system of a down-the-hole hammer

Mechanical detent jars

Mechanical directional drilling jar with swivel means

Mechanical drill string jar

Mechanical jarring devices for use in drilling

Mechanical jarring tool

Mechanical well jar

Mechanical-hydraulic double-acting drilling jar

Mechano-hydraulic double-acting drilling jar

Method and apparatus for driving sheet piles into the ground

Method and apparatus for establishing an anchor

Method and apparatus for installing pipes in off-shore locations

Method and apparatus for laying pipes in the ground

Method and apparatus for subsurface exploration

Method for constructing a tunnel or underpass

Method for lowering ground water

Method for performing ground or rock work and hydraulic...

Method for placement of production casing under obstacle

Method for settling anchoring device in the ground

Method for the production of piles cast in the ground and hollow