Advanced digital telemetry system for monocable transmission fea

Apparatus for electromagnetically coupling power and data signal

Apparatus for the control and monitoring of a well head submerge

Borehole measurement and telemetry system

Data transmission system for logging tools

Device for exploring an underground formation crossed by a horiz

Downhole digital power amplifier for a measurements-while-drilli

Downhole pressure and temperature monitoring system

Downhole telemetry apparatus and method

Electrical connector for borehole telemetry apparatus

Electronic well tools and multi-channel recorder

Inground boring technique including real time transducer

Method and apparatus for communicating with downhole measurement

Method and apparatus for data transmission between a transmissio

Method and apparatus using a well casing for transmitting data u

Method of transmitting ultrasonic amplitude & time travel inform

Parameter telemetering from the bottom of a deep borehole

Parameter telemetering from the bottom of a deep borehole

Parameter telemetering from the bottom of a deep borehole

Power-conserving self-contained downhole gauge system