17 Plastics in extruded form for use in manufacture; semi-finished plastic materials in compact or expanded form being foils, plates, rods, profiles, hoses, tubes, and blocks for use in a variety of industries; crude rubber and goods of rubber, not included in other classes, namely, goods of rubber for insulation, goods of rubber for use in vibration damping and goods of rubber for use in vibration suppression, namely, shock buffers of rubber for industrial machines; soundproofing materials; semi-worked rubber and plastic materials in the form of panels, belts, moulds and compounds for further manufacture of elastic coverings for absorbing vibrations, oscillations and impacts in machinery; semi-finished products in the nature of pellets of synthetic elastomer resins and resilient materials in the nature of semi-worked rubber which can be used for insulation and damping of vibrations, noise and mechanical shocks in machinery