Coordinates: 47°26′59″N 19°4′43″E / 47.44972°N 19.07861°E
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The Weiss Manfréd Acél- és Fémművek ("Manfréd Weiss Steel and Metal Works"), or colloquially Csepel Művek ("Csepel Works") was one of the largest machine factories in Hungary, located on Csepel island outside Budapest. It was the second largest industrial enterprise in the Austro-Hungarian Monarchy, and the biggest industrial enterprise in the Hungarian half of the Empire. It played an integral role in the heavy industry and military production of the Austro-Hungarian Monarchy. Founded by Baron Manfréd Weiss of Csepel, a Jewish industrialist, by the time of World War I the company was one of largest defense contractors in Austria-Hungary, producing all types of equipment, from airplanes and munitions to automotive engines and cars. Badly damaged by Allied air raids and eventually pillaged during World War II, the company continued in existence until 1950, when it was nationalised and renamed to Rákosi Mátyás Vas- és Fémművek ("Mátyás Rákosi Iron and Metal Works NV", where "NV" means Nemzeti Vállalat, "National Company").
In late 19th century, the company, then owned exclusively by Manfréd Weiss, expanded into production of ammunition for the Austro-Hungarian Army and Navy. The new factory produced all types, from small arms to artillery shells. Thus Manfréd Weiss became one of the principal defence contractors for the Hungarian part of the empire, his main competitor being the state-owned steel mill in Diósgyőr, the Diósgyőr-Vasgyár. In 1906, the company was supported by Hungarian Society of Industrialists, who lobbied for a new law that would allow state-owned companies to produce only products unobtainable from private companies. With such support, the Manfréd Weiss Works soon emerged as the largest firm on the market.