Two harvesters having improved design were finished in the experimental shop of the department of harvesters in summer 1931, they were named «Stalinetz». Our harvesters were tested in the fields of the farm «Hutorok» in the Krasnodar Region together with harvesters «Oliver», «Holt» and «Caterpiller», USA.

During the early of the war, thousands of employees of Rostselmash went off to war. Their wives, sisters and children replaced them at their work places. Shops of the enterprise were quickly converted to military production.  Machines were installed without foundation on common joists enabling to dismantle and displace equipment within some hours.

In the middle fifties, specialization of production enterprises was outlined in the national economy. Since August 1955, Rostselmash started to produce grain harvesters in accordance with the decision of the July Plenum of the Central Committee.

In February 1962, Rostselmash began to produce the next  model — «SK-4» which was 25% more efficient than the previous model. This machine was honored with the first degree diploma of the international show in Leipzig in 1963. This model won a medal in Czechoslovakia in 1964 and got the highest award — the «Silver Cup» in Hungary in the same year.