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
F17C3/02
with provision for thermal insulation
F17C3/08
by vacuum spaces, e.g. Dewar flask