Paragraph 4
Production and processing of metals
installations for the production of pig iron or steel (primary or secondary fusion) including continuous casting;
installations for the processing of ferrous metals:
hot-rolling mills;
smitheries with hammers;
application of protective fused metal coats;
ferrous metal foundries;
installations for the smelting, including the alloyage, of non-ferrous metals, excluding precious metals, including recovered products (refining, foundry casting etc.);
installations for surface treatment of metals and plastic materials using an electrolytic or chemical process;
manufacture and assembly of motor vehicles and manufacture of motor-vehicle engines;
shipyards;
installations for the construction and repair of aircraft;
manufacture of railway equipment;
swaging by explosives;
installations for the roasting and sintering of metallic ores.