As a consequence of a reform process within the International Telecommunication Union (ITU), the CCITT ceased to exist as of 28 February 1993. In its place, the ITU Telecommunication Standardization Sector (Itü-T) was created as of 1 March 1993. Similarly
ITU-T R.9-1993 history
1993ITU-T R.9-1993 How the Laws Governing Distribution of Distortion Should Be Arrived at - Telegraphy Telegraph Transmission (Study Group IX) 4 pp