F MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
F17 STORING OR DISTRIBUTING GASES OR LIQUIDS
F17C VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
2221/00 Handled fluid, in particular type of fluid