ali beheshti, one of the technologists of our country who are working in the field of nano technology, is with us to talk more about the application of nano and its market development. let's talk hello mr. tehari, i would like to thank you first . how many products have been presented in this year's exhibition, how much space is there for the development of the market of nano technological products, of course, are new nano technological products available, in the name of allah , the most merciful, i am also at your service, and i say hello to you. in this year's exhibition, 90 companies are present in a cluster, but in other about 140 companies are present in the exhibition sections and they presented their designs in different sections. in this year's exhibition, new products will be unveiled tomorrow, god willing, in the presence of the vice president of science, technology and economics. about 10 products with high technologies such as drugs in the field of nano coatings will be unveiled and we will have the signing of industrial contracts between large industrial companies and nan