Panstwowe Zaklady Lotnicze (PZL)
   
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PZL (Państwowe Zakłady Lotnicze - State Aviation Works) was the main Polish aerospace manufacturer of the interwar period, based in Warsaw, functioning in 1928-1939. The abbreviation was thereafter - from late 1950s - used as an aircraft brand and as a part of names of several Polish state-owned aerospace manufacturers referring to traditions of the PZL, belonging to the Zjednoczenie Przemysłu Lotniczego i Silnikowego PZL - PZL Aircraft and Engine Industry Union. After the fall of communism in Poland in 1989, these manufacturers became separate plants, still sharing the PZL name. In the case of PZL Mielec, the abbreviation was later developed as Polskie Zakłady Lotnicze - Polish Aviation Works.


Source: Wikipedia