In 1934, Ziller developed and patented a mechanically releasable hook connection, for which he introduced the brand name NILOS (derived from "never loose"). The following year saw the worldwide distribution of NILOS conveyor belt equipment, which quickly established itself as a major innovation in the mining industry. The company set up its own production facility in Sheffield, England, but lost it again during the Second World War. After the end of the war, Ziller founded the company "Hans Ziller Stahlbau" in Chemnitz and dynamically continued the development of conveyor belts and their repair. A significant innovation was the introduction of stationary conveyor belt repair.

In 1965, Hans J. Ziller received several awards for his outstanding achievements. The Technical University of Aachen awarded him an honorary doctorate, and he received the Diesel Medal in Gold and the Federal Cross of Merit of the Federal Republic of Germany. This year also saw the development of the NILOS-RING, an all-metal seal for ball and roller bearings, which established itself worldwide as a reliable solution in mechanical engineering.

In 1967, the Paul Wever company was transformed into HANS ZILLER Kommanditgesellschaft. A new management team of long-standing employees led the company to new products and markets under the motto of diversification. The sales strategy was adapted and from then on NILOS also presented itself internationally at trade fairs.

In the 1970s, NILOS continued to expand and supplied markets worldwide. NILOS equipment was increasingly used for large-scale mining of lignite and hard coal in particular. At the same time, environmental protection became an important issue and NILOS developed rubber wear protection products to reduce noise and wear.

In 1985, Hans J. Ziller died after a short illness at the age of 78. His three sons and his daughter took over the management of the company. Three years later, in 1988, the company was concentrated in Hilden on Reisholzstrasse, where a new administration, development, production and research center was built and occupied. With this reorganization, the company faced the challenges of the future and continued its successful history.