Customs exemption amendment: Mobile Switching Office added to notified list, altering scope of exemptions under Customs law. The Central Government, under sub section (1) of section 25 of the Customs Act, 1962, amends Notification No. 21/2002 Customs by inserting 'Mobile Switching Office (MSO)' into the Annexure, adding it after item twelve in List 24 and thereby including MSO within the exemption coverage of the principal notification.