Inground boring technique including real time transducer

Insulated drill collar gap sub assembly for a toroidal coupled t

Integral transducer housing and method

Integrated, single collar measurement while drilling tool

Intrinsically safe data network

Laterally translatable data transmission apparatus

Link module for a downhole drilling network

Logging device data dump probe

Logging or measurement while tripping

Logging sondes for use in boreholes

Logging while drilling tool with azimuthal sensistivity

Logging while tripping with a modified tubular

Long range multiple point wireless control and monitoring system

Low frequency electromagnetic telemetry system employing...

Magnetic signalling in pipelines

Magnetic signalling in pipelines

Measurement while drilling electromagnetic telemetry system...

Measurement while drilling mud pulser control valve mechanism

Measurement-while-drilling acoustic system employing...

Measuring tool for collecting down hole information and metering