| http://www.w3.org/ns/prov#value | - By way of illustration, hydrocarbonaceous residues (including residual petroleum) may be cleaned from tankers, barges, storage tanks, tank cars and trucks, pipelines, and other containers used to transport or to store crude oil or petroleum fractions, by washing the oil-contaminated surfaces of such vessels with the emulsifying agent, using an amount of ??-emulsan in the solution which can be pred
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