… mounted horizontally one above the other in heavy metal housings, the metal being passed through an adjustable gap … ends in necks, often specially shaped for mounting in the housings of the rolling mill. Outside the roll necks, …
… excluding ultra‑violet or infra‑red lamps : 8539.21 ‑ ‑ Tungsten halogen 8539.22 ‑ ‑ Other, of a power not exceeding … is maintained. These electrodes are generally of carbon or tungsten. Some lamps have an automatic device to bring the …
