CATALÀ | FRANÇAIS | ENGLISH A company of: ABOUT US THE PROCESS PRODUCTS NUR I + D + I CONTACT GALLERY GMN is part of the operational network of: WELCOME Gestión Medioambiental de Tumáticos is a company dedicated to the recovery of end-of-life tires. Download GMN catalog. NOVELTY! Download the 2014 Annual Summary of COMSA Corporación © Gestión Medioambiental de Neumáticos, SL Manager code nim. E-846.04.