Intercom apparatus; Intercom key apparatus; Intercom key apparatus for connection to telephone networks; Intercom key terminals for connection to a telephone network; Intercommunication apparatus; Intercommunication installations; Intercommunication systems; Intercommunications apparatus for installation in vehicles; Telephone intercom apparatus; Telephones incorporating intercommunication systems; Video intercom apparatus; Alarm bells; Alarm bells, electric; Intruder alarms (other than for vehicles); Security alarm systems (other than for vehicles); Apparatus for use in access control; Controlled access security apparatus (closed circuit television); Electric access security apparatus; Electric controlled access security apparatus; Electronic access control installations; Electronic apparatus for controlling access; Installations (electric or electronic) for use in access control; Apparatus for controlling cameras; Cameras; Closed circuit television surveillance cameras; Electronic cameras; Remotely controlled cameras and other remotely controlled sensors; Video camera security apparatus; Video camera security installations; Video camera security instruments; Video cameras; Video cameras adapted for monitoring purposes; Video cameras adapted for security purposes; Video surveillance cameras; Security surveillance apparatus; Video surveillance apparatus; Bells (warning devices); Bells for doors; Bells, signal; Electric door bells; Electrical bells; Push buttons for bells