37 Installation, cleaning, repair and maintainance, in relation to the following goods: apparatus and instruments for signalling, perceiving, transforming, recording, transmitting or reproducing, detecting and analysing signals, sounds and images, sensors and detectors; installation, cleaning, repair and maintainance, in relation to the following goods: security, safety, protection and signalling apparatus, alarms and warning equipment, measuring, detecting and monitoring instruments, indicators and control units, including sensors for detecting liquids, diseases, seizures and similar incidents, pressure sensors; installation, cleaning, repair and maintainance, in relation to the following goods: apparatus and instruments for vibration signals, transmitting and receiving, alarms for people having impaired hearing and/or vision, signals, luminous and/or mechanical, warning signals, bells [warning devices], flashing lights [signal lights]; installation, cleaning, repair and maintainance, in relation to the following goods: buzzers, amplifiers, television, radio, computer and internet listening devices, radio, infrared and wired communication apparatus, in-ear monitoring systems, transmitters, batteries for use in hearing aids, receiving apparatus, transceivers, mini earphones and headphones; installation, cleaning, repair and maintainance, in relation to the following goods: audio-amplified telephone signals, flashing telephone signals, telephone amplifiers, public address systems, microphones, electronic apparatus for the remote transmission of telephone, doorbell or alarm signals via a signal detector to a sound and/or light signal transmitter, signal amplifiers, wireless transmitting and receiving equipment, audio amplifiers; installation, cleaning, repair and maintainance, in relation to the following goods: apparatus and instruments for aiding, facilitating and making it possible to hear and/or otherwise perceive sound and signals for deaf people, people having impaired hearing and/or people having impaired vision, surgical and medical apparatus and instruments for the protection, examination and treatment of hearing deficiencies, deafness, the ear and the function of the ear; installation, cleaning, repair and maintainance, in relation to the following goods: hearing aids, hearing protectors, ear plugs, mobility aids, hearing aids, medical apparatus and instruments; installation and maintenance of sensors and detectors, security, safety, protection and signalling apparatus, alarms and warning equipment.