Methods and systems for calibrating acoustic receivers Grant US-7085194-B2 United States of America 01 Aug 2006
IMPROVED GEOPHONE CALIBRATION TECHNIQUE Application WO-2006021877-A3 World Intellectual Property Organisation (WIPO) 18 May 2006
METHODS AND SYSTEMS FOR CALIBRATING ACOUSTIC RECEIVERS Application WO-2005062078-A1 World Intellectual Property Organisation (WIPO) 07 Jul 2005