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G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
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FR1149108D1953-06-151953-06-15Procédé et appareil pour la détermination de la direction de la composante d'un champ magnétique dans un plan déterminé
ExpiredFR1149108A
(fr)