17 Indiarubber in the Form of Sheets, Blocks, Rollers and Rods Used in Basic Manufacturing Processes; Plastics in the Form of Sheets, Block Rollers and Rods Used in Basic Manufacturing Processes; Indiarubber Valves, Rings, Rollers, Couplings Sleeves Springs, and Dampers for Absorbing Shock; Indiarubber and Plastic Hoses and Tapes and Rollers; Packaging Tape, Indiarubber and Plastic Materials Used in Packaging as Packing Material and for Insulating