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21 July 1955 - The BBC brings into service its Divis transmitter, its first permanent 405-line VHF Band I facility serving Northern Ireland, marking the launch of a television service for Northern Ireland; the 35 kW transmissions can also be readily received in much of the Republic of Ireland.
July 21 - The BBC brings into service its Divis transmitter, its first permanent facility serving Northern Ireland, marking the launch of a television service for Northern Ireland; the 35 kW transmissions can also be readily received in much of the Republic of Ireland.