"Prva petoletka" - Trstenik was founded on March 23. 1949., by decision of the Government of People's Federal Republic of Yugoslavia, at the beginning of the first Five-year plan of development, after which it was named.

Five decades of operation and future development are based on the basic activities: research, design, projecting, testing, inspection, manufacture, assembly and servicing of all products within the versatile product range of PPT.

"Prva petoletka" is an integral supplier of all types of hydraulic and pneumatic components and systems, in all areas of application, from submarines to airplanes.

"Prva petoletka" has the Quality System complying with requirements of ISO-9001, certified by TÜV CERT, for brake and other devices and system for road and rail vehicles, farming and construction machinery, devices and systems for lubrication, transfer of fuel and lubrication, refrigeration, air conditioning, load manipulation, production of compressed air, signalization and safety and turbo chargers.

Seals are manufactured by the relevant joint-stock company within the Company. The production range meets the needs of PPT, and more than half of the volume of production is exported.

Seals Department with its in-house development, many years of experience and co-operation with world famous companies in this field, successfully resolves all problems dealing with sealing and offers to the market a wide range of sealing products.