The traditional engineering industry is still a major source of Swedish inventions, but pharmaceuticals, electronics and other high-tech industries are gaining ground. Tetra Pak was an invention for storing liquid foods, invented by Erik Wallenberg. Losec, an ulcer medicine, was the world's best-selling drug in the 1990s and was developed by AstraZeneca. More recently Håkan Lans invented the Automatic Identification System, a worldwide standard for shipping and civil aviation navigation. A large portion of the Swedish economy is to this day based on the export of technical inventions, and many large multinational corporations from Sweden have their origins in the ingenuity of Swedish inventors.