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Published on Jan 6, 2011
Installing BRITAX ROUNDABOUT 55, MARATHON 70, BOULEVARD 70, BOULEVARD 70 CS, and ADVOCATE 70 CS Convertible Car Seats rear facing using the vehicle lap/shoulder belt and one lock-off. These instructions apply to USA convertible seats manufactured on or after October 5, 2010. **Refer to your user guide for complete installation instructions.