CPC Subgroup
G01V 3/06 using AC
Full Title
Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation > operating with propagation of electric current > using AC
G01V 3/06 Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation > operating with propagation of electric current > using AC