Damper pressure control apparatus for hydraulic rock drill

Device and method for installing ducts in holes produced by soil

Device for introducing additional air into intake passage leadin

Device for limiting a torque to be transferred

Device for sensing the direction of rotation of a hand tool...

Device for soil sampling under water

Device for the production of earth holes

Directional valve means for positioning machine units

Discontinuous tightening wrench comprising means for...

Displaceable gear torque controlled driver

Drill boom with hydraulic parallel motion means

Drill boom with hydraulic parallel motion means

Drill feed control utilizing a variable overcenter valve

Drill mounting device for backhoe attachments

Drill rig having alternate spindle drive

Drill rig having automatic spindle stop

Drill rig shut-off system

Drill slide for rock drilling apparatus

Drill with solid state speed control

Drilled hole end adjusting arrangement