17 non-contact gas seals, namely, rings of rubber for use as pipe connection seals; rubber packings, namely, rubber packing for shipping containers; asbestos packing for valves and pistons; packing and insulating material, namely, cork packing; plastic packing for shipping containers; oil valves made of elastic rubber or hard rubber; plastic sheets for construction and general use; plastic in the form of sheets for use in manufacturing, namely, plastic laminated boards and plastic boards; plastic film for commercial and industrial use; electrical insulating rubber products; electrical insulating tapes; electrical insulating materials, namely, electrical insulating papers, electrical insulating fabrics and electrical insulating boards; seals in the nature of packing made of metal, namely, packing material forming seals; non-metal gaskets for use in commercial, industrial and retail machines; materials for packing, stopping or insulating, namely, packing and insulating material, and plastic packing for shipping containers; joint packing made of non-metallic materials for metal and non-metal pipes; non-metallic seals for use in commercial, industrial and retail machines; non-metal pipe couplings and joints; packing material for forming seals; padding made of rubber or plastics for use in pipes; flexible tubes not of metal, namely, rubber tubes; joint packing for pipes in machines; valves of rubber or vulcanized fiber; non-metal sealing rings used as rotary-shaft packings; sealing rings not of metal; non-metal couplings for flexible pipes; electrical insulating tapes; electrical insulating materials