The testing facility began to award the ESČ mark

In the following years, the activities of the ESČ testing facility expanded further, and the range of tested and marked products continued to grow. In 1930, refrigerators, vacuum cleaners, electricity meters, three-phase outdoor sockets and other products came under the permanent control of ESČ. The ESČ testing facility did not limit its focus to type and control tests, but also conducted numerous comparative and research tests, contributing significantly to the clarification of certain controversial issues concerning the creation of standards, and participated in the development of new test methods for various products.

In 1934, the Ministry of Public Works granted the ESČ testing facility official authorization, which resulted in the requirement that only material complying with ESČ regulations could be used in buildings built or supported by the state. The ESČ mark became a respected certificate of product safety and we are happy to say the mark has retained the same significance to this day.