Apparatus with one or more particular functions for connection to public switched telephone networks run by certain public telecommunications operators - specification for apparatus with loudspeaking facilities 连接由某些公共长途电话接线员操作的公共开关电话网络用单功能或多种特别功能设备.带扬声器的设备规范
2.
Text for bs 6789 : part 2 : 1992 " apparatus with one or more particular functions for connection to public switched telephone networks run by certain public telecommunication operators . part 2 . specification for apparatus with loudspeaking facilities Bs 6789 pt . 2 - 92 "由某些公共长途通信接线员操作的公共交换电话网连接用单功能或多种特别功能装置" .第2部分:有扩音设备装置规范
3.
Draft standard to match to and work with ets 300 001 net4 " apparatus with one or more particular functions for connection to public switched telephone networks run by certain public telecommunications operators " . specification for apparatus with loudspeaking facilities 与ets 300001 net4相适应的标准草案"由某些公共长途通信接线员操作的公共交换电话网连接用单功能或多种特别功能装置.第2部分:有扩音功能设备的装置规范
