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Transcripción del abstract original del autor: For image and competitive reasons a working group consisting of Ruhrgas AG, the producer of fragrances and flavors Haarmann & Reimer GmbH and DVGW-Forschungsstelle am Engler-Bunte-Institut der Universität Karlsruhe (TH) has developed the sulphur-free odorant Gasodor™ S-free™. The results received in extensive investigations in relation to the warning smell and compatibility with the materials used in public gas supply as well as the results of the field testverify the sulphur-free odorant’s suitability for use in public gas supply. Recommendations can be derived from the knowledge gained from these applications in view of the preparations to be made and of the execution of the change from a sulphurous odorant to the sulphur free.