The following companies are subsidiares of ION Geophysical: ARAM, AXIS Geophysics, CompuSeis, Concept Systems Holdings, Concept Systems Holdings Limited, Concept Systems Limited, DeRegt Special Cable, DigiCourse Inc., GMG/AXIS Inc., GX Geoscience Corporation S. de R.L. de C.V., GX Technology, GX Technology Australia Pty Ltd., GX Technology Canada Ltd., GX Technology Corporation, GX Technology EAME Limited, GX Technology Imaging Services Limited, GX Technology Poland Sp. Z o.o., GX Technology Processamento de Dados Ltda., GX Technology Sismica Brasil Ltda., GX Technology Trinidad Ltd., Global Dynamics, Green Mountain Geophysics, I/O Cayman Islands Ltd., I/O International Holdings Ltd., I/O International Ltd., I/O Luxembourg S.à r.l., I/O Marine Systems Inc., I/O Marine Systems Limited, I/O U.K. Holdings Limited, ION China Holdings Limited, ION E&P Advisors Inc., ION EPA Holdings Inc., ION Exploration Products (U.S.A.) Inc., ION Geophysical CIS LLC, ION Geophysical Sdn. Bhd., ION HPC Services Inc., ION Inc., ION International Holdings L.P., ION International S.à r.l., IPOP Management Inc., OceanGeo, OceanGeo B.V., OceanGeo Inc., OceanGeo Ltd., Oceangeo Tecnologia de Exploração de Reservatórios do Brasil EIRELI, Pelton, Q.C. Tools, Sensor Nederland B.V., and “Inco” Industrial Components ‘s-Gravenhage B.V..
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