Other major industries include textile mills and metallurgic industries. Syros still has naval shipyards, metallurgic industry and tanneries. The carbonization temperature is lower compared with to for producing metallurgic coke. Hilden once has harboured textile factories, a big paint enterprise, pharmaceutical and metallurgic companies. Precise factory Iskra belonged to sports federation Stal, banding together the metal and metallurgic works. Sisak features the largest metallurgic factory and the largest oil refinery in Croatia. He enthusiastically described his company's adoption of vanadium steel alloys and subsequent metallurgic R&D work. Tocopilla has metallurgic, chemical and nitrate treatment industries, along with the power plant. It had a peak of 1,500 naval and metallurgic workers. This region was well-knew for its wine and metallurgic centres. Petrovsky plant became one of the largest metallurgic plants (3rd place) in southern Russia. He was also a metallurgic engineer known for the development of gold cyanidation in Russia. In 1930 the metallurgic institute was opened, in 1934 the agricultural institute was organized. He took courses in chemistry and biology and learned advanced metallurgic techniques.