4. Production and processing of metals
(a)Installations for the production of pig iron or steel (primary or secondary fusion) including continuous casting;
(b)Installations for the processing of ferrous metals:
(i)hot-rolling mills;
(ii)smithies with hammers;
(iii)application of protective fused metal coats;
(c)Ferrous metal foundries;
(d)Installations for the smelting, including the alloyage, of non-ferrous metals, excluding precious metals, including recovered products (refining, foundry casting, etc);
(e)Installations for surface treatment of metals and plastic materials using an electrolytic or chemical process;
(f)Manufacture and assembly of motor vehicles and manufacture of motor-vehicle engines;
(g)Shipyards;
(h)Installations for the construction and repair of aircraft;
(i)Manufacture of railway equipment;
(j)Swaging by explosives;
(k)Installations for the roasting and sintering of metallic ores.