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A draft amendment to BS 6789-1:1984 "Apparatus with one or more particular functions for connection to the British Telecommunications public switched telephone network. Part 1. Specification for general requirements"
BS PD 6561 – A draft amendment to BS 6789-1:1984 "Apparatus with one or more particular functions for connection to the British Telecommunications public switched telephone network. Part 1. Specification for general requirements"
