Article 18 - Notification Article 19 - Notifying authorities Article 20 - Requirements relating to notifying authorities Article 21 - Information obligation on notifying authorities Article 22 - Requirements relating to notified bodies Article 23 - Presumption of conformity of notified bodies Article 24 - Subsidiaries of and subcontracting by notified bodies Article 25 - Application for notification Article 26 - Notification procedure Article 27 - Identification numbers and lists of notified bodies Article 28 - Changes to notifications Article 29 - Challenge of the competence of notified bodies Article 30 - Operational obligations of notified bodies Article 31 - Appeal against decisions of notified bodies Article 32 - Information obligation on notified bodies Article 33 - Exchange of experience Article 34 - Coordination of notified bodies