Recommendation S.4 (11/1988): Special use of certain characters of the International Telegraph Alphabet No. 2
superseded recommendation/international standard from the International Telecommunication Union
ITU Telecommunication Standardization Sector
Special use of certain characters of the International Telegraph Alphabet No. 2
Recommendation F.1 (11/1988): Operational provisions for the international public telegram service
Recommendation F.30 (11/1988): Use of various sequences of combinations for special purposes
Recommendation F.60 (11/1988): Operational provisions for the international telex service
Recommendation R.79 (11/1988): Automatic tests of transmission quality on telegraph circuits between switching centres
Recommendation S.11 (11/1988): Use of start-stop reperforating equipment for perforated tape retransmission