| http://www.w3.org/ns/prov#value | - Check oxygen content before entering area.The symptoms of lung oedema often do not become manifest until a few hours have passed and they are aggravated by physical effort.Rest and medical observation is therefore essential.Chlorofluorocarbons are known to cause effect on the cardiovascular system.Freon 12-B2 and Halon 1202 are trade names.
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