Chemical products included in Class 1 for use in the treatment of water and steam; chemical compounds for addition to fuel oil to prevent and remove sludge, to improve combustion and to eliminate deposits of soot and scale. entry cancelled under section 34 (1) (d) of the Trade Marks Act, 1938, in respect of all goods except chemical products included in Class 1 for use in the treatment of water and steam; chemical compounds (none being lubricants) for addition to fuel oil (none being lubricants) to prevent and remove sludge, to improve combustion and to eliminate deposits of soot and scale.;