Technical basis for development of the post-war Signal Corps of Czechoslovak Army was given by the armaments production of former Protectorate. After May 1945, the German design school, making use of up-to-date technology introduced to the Protectorate radio-technical factories by the occupants, together with the pre-Munich production tradition, started a vigorous development of national communication means. At the beginning, it was the activation of trophy equipment which was the main task of the newly established Military Technical Institute which included the sphere of military electronics in its Department II. The first designs appeared in the former Military Telegraph Workshops, Kbely, (in the Protectorate – Ostmark Werke) as early as the year 1946. They were responsible for development of military communication equipment within Military Technical Institute. The designers who participated in wartime production, being under the influence of German design school, developed a new generation of Czechoslovak communication equipment. They gradually developed RF-11, RO-21 and RM-31 radio stations.