built. In 1949, the factory was renamed, like all Polish aerospace industry at that time, as Wytwórnia Sprzętu Komunikacyjnego – zakład nr 1 (Communication Equipment Factory, No. 1 plant), in short WSK-1 Mielec or just WSK-Mielec. For a short time in 1970-1975, it bore a name WSK Delta-Mielec. In 1975, it returned to a traditional name Wytwórnia Sprzętu Komunikacyjnego "PZL-Mielec" (WSK "PZL-Mielec"), in an honor of the PZL brand. In the 1950s, there were 2600 workers; at its peak the number was 18,000. From 1950, the factory developed significantly, and became the largest Polish aircraft producer. It was a licensed producer of the Soviet-designed jet fighters MiG-15 (produced as Lim-1), MiG-15bis (Lim-2), MiG-17 (Lim-5), and their Polish-developed variants (the SBLim-1 and SBLim-2 trainers and the Lim-6 attack aircraft). The first Lim-1s were manufactured from Soviet parts in 1952, and full-scale production started in 1953. About 1500 Lims were built by 1964. In 1957-1960, there were also produced 250 Polish-designed TS-8 Bies piston-engined trainers. From 1963, there was produced Polish-designed jet trainer TS-11 Iskra, being a basic trainer in Polish military aviation. Its successor, designed with a part of PZL Mielec, the PZL I-22 Iryda, appeared to be a failure for different reasons, mostly due to a lack of proper funding, and as such only a small series was built. The most numerous aircraft built in Mielec was the licensed Soviet Antonov An-2 utility biplane, produced from 1960 in different variants. 11,954 of these aircraft were manufactured by 2002, mostly for the Soviets, but also used in Poland, and exported to other countries. Among them there were 7880 agricultural An-2R, 1640 transport-passenger An-2TP, 1344 transport An-2T, 816 passenger An-2P, 154 An-2M floatplanes, 52 An-2TD military paratroop transports, 44 executive An-2P Lux. From 1984, PZL Mielec became an exclusive producer of the Soviet Antonov An-28 STOL transport airrcaft, of which 180 were built. It was subsequently developed in Mielec, and in a modernized variant PZL M-28 Skytruck/Bryza, with western avionics, was offered for the Polish Army, Polish Navy and services abroad, with some success, also as a maritime patrol aircraft. Apart from license production, several aircraft were designed at Mielec in the 1950s and 1960s, but they did not enter production (e.g PZL S-4 Kania, PZL M-2, PZL M-4 Tarpan). More profitable was cooperation in design work. In 1973, with Soviet aid, Mielec designed the only jet agricultural aircraft in the world,