The presence of Yekta Sanat Naji company in the 20th Exhibition of Research and Technology Achievements on 26 to 29 December 2018 at the permanent location of Tehran International Exhibitions, with the presence of research institutes, universities, science and technology parks, growth centers, institutes research as well as some related ministries and executive organisations and the unveiling of the new ultrasound machine of Yekta Sanat Naji Company, the S series portable Color Doppler machine.