Sensors including electronic sensors for quality and production monitoring on textile machines; yarn clearers, yarn break detectors and cutting devices including electronic and opto-electronic yarn clearers, yarn break detectors and electro-magnetic cutting devices for textile yarns, in particular for quality inspection and production monitoring; monitoring systems and instruments including electronic systems and instruments for textile machines, in particular for ring spinning frames, open end spinning machines, winders and automated winders; testing and measuring apparatus and instruments for the determination of physical properties of textile fibres; image processing apparatus, including such apparatus for measuring properties of textile fibres and yarns; computer systems and computer programs including such systems and programs for collecting, processing, interpreting and process-simulating of process and laboratory data in the textile industry; computers, data carriers, net-works and computer programs for computer integrated manufacturing, including such goods for manufacturing in the textile industry; distribution boxes for local electrical net-works, transformers and distribution substations in particular for the distribution of electric energy as well as for telecommunication nets and control systems; empty enclosures and housings including enclosures and housings made of fibre-reinforced polymers for the protection of outdoor sites technical apparatus against climatic and weather influences; switch gears including medium voltage switch gears for the distribution of electric energy, in particular compact ring mains in SF6-technique, vacuum and air/solid isolated; connector systems, including connector systems for medium voltage cables and discharges; security systems for the distribution of electric energy, including earthing devices, equipotential bonding conductors, dischargers and protectors; installations systems for industry and for public buildings, including cable routing systems, cable conduits and carriers; connector systems for telecommunication nets and controlling devices, including in solderless, screw-free and bared connecting techniques; all other class 9 goods