Molded parts of rubber (semi-finished products); semi-processed plastic materials and resins; semi-processed plastic materials; semi-processed synthetic resins; synthetic resins in the form of sheets for use in manufacturing operations (semi-finished products); extruded plastics in sheet form for use in manufacturing operations; synthetic resins in the form of blocks for use in manufacturing operations (semi-finished products); extruded plastics in the nature of blocks for use in manufacturin...