16 [printed material for computer aided design, creation and documentation of mechanical or electron-mechanical parts, products or components, in particular, circulars, magazines, brochures, flyer sheets, books, catalogues, extracts of articles, data sheets, printed product system and application notes, technical announcements, product and system usage and service guides; printed material for computer aided design of metal parts, products and components, in particular, circulars, magazines, brochures, flyer sheets, books, catalogues, extracts of articles, data sheets, product and system application usage and service guides, technical announcements, product and system usage and service guides; printed material for product data administration, work flow administration and task sharing, in particular, circulars, magazines, brochures, flyer sheets, books, catalogues, extracts of articles, data sheets, product and system application information, technical announcements, product and system usage and service guides; instruction manuals and books for teaching computer aided design, creation and documentation of mechanical or electro-mechanical parts, products or components; instruction manuals and books for teaching computer aided design of metal parts, products and components; instruction manuals and books for teaching product data administration, work flow administration and task sharing; instruction manuals and books for teaching computer aided design of metal parts, products and components]