In 1952 The Aviation Enterprise was called The Factory of Transportation Equipment (WSK) which introduced the diversification into the automotive industry where vehicles, Leyland licensed diesel engines, fuel injection pumps and electric vehicles (MELEX) were manufactured.
During the next decades the town impressively developed as a result of WSK Mielec development. In the eighties the first symptoms of economic depression appeared and the beginning of transformation in 1989 disclosed all weaknesses in the central management which managed the total plant including the vireos products and technologies.
The response to the negative impact coming form the restructuring of the plant was the idea of creating the Special Economic Zone within the former WSK and in adjacent areas for new development. The zone was established in 1995 as the first Special Economic Zone in Poland and was called SEZ EURO-PARK MIELEC.