A self-contained data acquisition unit is provided for acquiring seismic data. The unit has a microprocessor and an antenna adapted to receive an electromagnetic signal. A decoder is connected with the microprocessor and adapted to convert received electromagnetic signals to dual-tone multiple-frequency...http://www.google.fr/patents/US20050276162?utm_source=gb-gplus-shareBrevet US20050276162 - Seismic-data acquisition methods and apparatus
Numéro de demande: 11/118,104 Numéro de publication: US 2005/0276162 A1 Date de dépôt: 28 avr. 2005 Brevet délivré: US7298671 ( Date de délivrance 20 nov. 2007)
