TGS-NOPEC Geophysical Company
 TGS-NOPEC Geophysical Company referred to as TGS and listed on the Oslo Stock Exchange was founded by a 1998 merger of TGS (Tomlinson Geophysical Services Inc.) Calibre Geophysical Co. Inc (founded 1981) and NOPEC (NOrwegian Petroleum Exploration Consultants) International ASA founded in 1981.TGS provides multi-client geoscience data to oil and gas exploration and production companies worldwide.