Machine for boring through ground formations

Machine for horizontal percussion boring

Machine for subsea operations

Machine having integral piston and cylinder wall sections

Machine operating according to the moineau principle,...

Magazine for storing drill string elements

Magnetic assemblies for deposit prevention

Magnetic assembly for use with a downhole casing perforator

Magnetic casing depth marker

Magnetic field enhancement for use in passive ranging

Magnetic hammer

Magnetic junk sub for oil wells and the like

Magnetic measurements while rotating

Magnetic particle separator for an abrasive jetting system

Magnetic ranging and controlled earth borehole drilling

Magnetic ranging while drilling parallel wells

Magnetic ranging whle drilling using an electric dipole...

Magnetic sensor system useful for detecting tool joints in a...

Magnetic signalling in pipelines

Magnetic slip retention for downhole tool