Sep 24, 2013 · Wadi, Vlf Instrument Finds Structures Where Useful Quantities Of Underground Water May Be Trapped In Rock Fractures And Cavities. Abem Is A Leading Worldwide Manufacturer Of Geophysical Instruments. In Late 1993, Nitro Consult Ab (A Member Of Dyno Nobel Europe) Acquired All Shares Of Abem. Abem And Nitro Consult Have Formed A Close …