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vac resid
abbr. vacuum resid (MichaelBurov); vacuum tower bottoms (MichaelBurov); resid (MichaelBurov); tar oil (MichaelBurov)
abbr., oil.proc. vacuum residues (MichaelBurov)
oil.proc. bottoms product from a column under vacuum (MichaelBurov); vacuum residue (MichaelBurov)