5/ For tests of the strength of seat-backs, seat anchorages, their adjustment, locking and displacement systems and tests of head restraint performance (paras. 6.2., 6.3. and 6.4.) only.
5/ For tests of the strength of seat-backs, seat anchorages, their adjustment, locking and displacement systems and tests of head restraint performance (paras. 6.2., 6.3. and 6.4.) only.