1syuzh. - Carrying out experiments on the use of solar energy with the help of a solar station (Tashkent). 2syuzh. - Mechanization of work on digging a ditch using a track plow (Tula). 3syuzh. - Testing of a new 2-seater aircraft designed by engineer Sheremetyev. 4syuzh. - The movement of a freight train on the railway using a car installed on the platform. 5syuzh. - New high-speed aircraft designed in the USA, lifted into the air. (New York).