GAS-HOLDERS OF VARIABLE CAPACITY

**Definition:** This place covers:

Gas-holders for the storage of compressed, eventually liquefied or solidified gas, with large volume, and whose volume capacity can be changed by special means. Storage of gas is the only purpose of gas-holders.

Warning: This subclass is pending a reorganisation. Documents are continuously reclassified to subclass F17B and deep indexing scheme F17C .

**Glossary:** - Gas: Substance that is in gaseous state of matter at normal conditions (atmospheric pressure and normal ambient temperature). Substances that are in a gaseous state of matter but would not be gaseous at normal conditions are not considered in this subclass. Gas can be put in liquid (liquefied gas), or solidified state of matter, for storage.