37 Construction of stands for trade fairs, exhibitions and museums; display stand installation services; installing temporary structures for trade fairs, museums, trade shows and trade exhibitions, signboard and panel installations; construction; construction of temporary structures; installing temporary structures for trade fairs, museums, trade shows and trade exhibitions; installing signboards and panels; construction and assembly, namely, of stands, stages and booths; construction of temporary structures; installing lighting systems in exhibitions; construction project management in the field of exhibition services involving the installation of prototypes, the installation of exhibition lighting media and systems, the installation of lighting devices and maintenance service thereof; installing automated and manual sliding panel systems