| http://www.w3.org/ns/prov#value | - 4. ( a ) Where gas other than carbon dioxide or halogenated hydrocarbon is produced on the ship and is used as an extinguishing medium, it shall be a gaseous product of fuel combustion in which the oxygen content, the carbon monoxide content, the corrosive elements and any solid combustible elements have been reduced to a permissibld minimum.
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