Radio equipment and systems ; radiotelex equipment operating in the maritime mf hf service ; technical characteristics and methods of measurement ; english version ets 300067 : 1990 无线电设备和系统.海上mf hf服务用无线电传设备运行
2.
Radio equipment and systems - radiotelex equipment operating in the maritime mf hf service - technical characteristics and methods of measurement ; english version ets 300067 : 1990 a1 : 1993 无线电设备和系统.海上mf hf服务的无线传真设备运行