9 Scientific, surveying, photographic, optical, measuring, signalling and checking apparatus and instruments, namely, fibre optic installations, optical fibre sensors, optical fibre cables and sheaths, fibre optic viewers, all for monitoring sewerage and drainage installations, water pipes for sewerage installations and waste pipes for sewerage installations; apparatus for recording, transmission or reproduction of images; data processing equipment; computer software for operating, installing, testing, diagnosing and managing fibre optic cables and accessing, recording, and analyzing data in the field of maintaining sewerage installations; optical cables; fibre optics; optical fibres; fibre optic cables; optical fibre cables; fibre optic patch panels; optical sensors; optical fibre sensors; fibre optic couplings; fibre optic receptors; fibre optic periscopes; nonlinear optical fibres; sheaths for fibre optic cable; junctions sleeves for fibre optics; fibre optic viewers; optical viewing screens, namely, video monitors; optical transmitters for use with fibre optic cables; fibres for the transmission of images; optical fibre temperature probes, other than for medical use; blank optical data carriers; optical electronic components, namely, optical receivers, digital transmitters; optical inspection apparatus for industrial use; optical measuring components, namely, optical fibre sensors, optical profilers, thermometers; water leakage detection alarms; water level indicators; water level detection apparatus; liquid level monitoring apparatus; water temperature gauges; visual monitoring apparatus, namely, video cameras, infrared cameras