Article 4 - Commission Regulation (EC) No 607/2006 of 19 April 2006 initiating an investigation concerning the possible circumvention of anti-dumping measures imposed by Council Regulation (EC) No 398/2004 on imports of silicon originating in the People's Republic of China by imports of silicon consigned from the Republic of Korea, whether declared as originating in the Republic of Korea or not, and making such imports subject to registration