17 Rubber, gutta-percha, gum, asbestos, mica and compounds therefor, in the form of sheets, rods, tubes, shaped pieces, panels, and slabs for industrial and manufacturing use; plastics in extruded form for use in manufacturing; polyamide films, plastics in granular form used for transformation by molding and extrusion; manmade nylon plastic resins in pelletized form for general industrial use