37 Installation, In relation to the following goods: loudspeaker installations, Microphones, audio speakers, Audio players, Radiocommunication transmitters, Radio receivers, amplifiers, Preamplifiers, related parts, Electric notice boards, in particular the aforesaid for numbers, sound transmission systems for hearing aids and aids to hearing, related parts, Microphone installations for discussions, repeater networks, beam steering loudspeakers, video components, video transmitters, apparatus for the transmission of images, in relation to the following fields: Streaming services; Installation, repair and maintenance of audio and video components and apparatus; Designing and setting up of public address systems