Locking device for a tool with telescopically displaceable parts
Long stroke jar bumper sub with safety sleeve
Make up system of a down-the-hole hammer
Mechano-hydraulic double-acting drilling jar
Method for performing ground or rock work and hydraulic...
Oil well jar
Percussive down-the-hole hammer and a drill bit therefor
Percussive down-the-hole hammer and a piston and drill bit...
Percussive down-the-hole hammer for rock drilling, a top sub...
Percussive down-the-hole hammer for rock drilling, and a...
Pilot-valve-controlled percussion drilling tool
Pneumatic drill hammer
Pneumatic drill with central evacuation outlet
Pneumatic impact damping device for a drill column
Pneumatic percussive device
Pneumatically reversible ram boring device
Pressure reversing valve for a fluid-actuated, percussive drilli
Pressurized fluid flow system for a reverse circulation hammer
Ram boring machine
Ram boring machine