The remote instrument reading and telemetry system of the present invention includes at least one instrument link interconnected to a data gathering device and a remote station interrogation apparatus. The interrogation apparatus and instrument link both include radio transmitters and receivers so information...http://www.google.fr/patents/US5438329?utm_source=gb-gplus-shareBrevet US5438329 - Duplex bi-directional multi-mode remote instrument reading and telemetry system
Duplex bi-directional multi-mode remote instrument reading and telemetry system
