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Principle and application of EH-4 electromagnetic system.

Ni Fengming and Liu Taisheng. PI,1999,13(1):32~34  
Electromagnetic exploration is an important geological measuring method. EH-4 electromagnetic instrument is produced recently in U.S.A., which can measure the resistivity of earth accurately from several meters to several thousands meters. It is also of the advantages of using conveniene and characteristic reliability. This paper instroduces the principle, construction and property of this kind of instrument.
【CateGory Index】: TM937
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