Ventilating apparatus

Telecommunications equipment including electrical devices for recording, emission, transmission, reception, reproduction and processing of sounds, signals, characters and/or images; devices for recording, processing, sending, transmission, switching, storage and output of messages and data; communications computers, software; optical, electrical and electronic telecommunication equipment, in particular telephone exchange and transmission devices such as telephones, videophones, telephone answering sets, dialling devices, domestic telephone systems, private automatic branch exchanges; photocopiers; telecommunication networks consisting of exchange and transmission equipment, individual modules and components of such equipment such as power supply units; transmission media such as telecommunication cables and optical fibres and pertinent connection elements; parts of all the appliances and devices mentioned above; systems consisting of a combination of the appliances and devices mentioned above