Commission Regulation (EC) No 1733/2003 of 30 September 2003 initiating an investigation concerning the alleged circumvention of anti-dumping measures imposed by Council Regulation (EC) No 119/97 on imports of certain ring binder mechanisms originating in the People's Republic of China by imports of certain ring binder mechanisms consigned from Vietnam, whether declared as originating in Vietnam or not, and making such imports subject to registration