An apparatus and method of communicating in a tubular system (20) through a media (65) disposed therein and actuating a controllable device (58) are disclosed. The apparatus and method utilize a transmission apparatus (16) at a transmission node that is in communication with the media (65). The transmission...http://www.google.fr/patents/US6710720?utm_source=gb-gplus-shareBrevet US6710720 - Pressure impulse telemetry apparatus and method
