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ERDA MIJ VOOR WETENSCHAPPELIJK
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ERDA MIJ VOOR WETENSCHAPPELIJK
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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
G01V3/12—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with electromagnetic waves
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FR565693D1922-09-191923-05-01Procédé et appareil pour perfectionner la détermination de la direction des ondes électromagnétiques
ExpiredFR565693A
(fr)