Sealing. The following parts must be sealed: (a) the installation plaque, unless it is attached in such a way that it cannot be removed without the markings thereon being destroyed; (b) the two ends of the link between the control device proper and the vehicle; (c) the adaptor itself and the point of its insertion into the circuit; (d) the switch mechanism for vehicles with two or more axle ratios; (e) the links joining the adaptor and the switch mechanism to the rest of the control device; (f) the casings required under Chapter III A 7 (b). In particular cases, further seals may be required on approval of the control device type and a note of the positioning of these seals must be made on the approval certificate. Only the seals mentioned in (b), (c) and (e) may be removed in cases of emergency; for each occasion that these seals are broken a written statement giving the reasons for such action must be prepared and made available to the competent authority.
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Sources: European Agreement Concerning the Work of Crews of Vehicles Engaged in International Road Transport (Aetr), European Agreement Concerning the Work of Crews of Vehicles Engaged in International Road Transport (Aetr)