?占线信号灯

... 占线信号 engaged signal 占线信号灯 engaged lamp; visual busy-lamp 占线指示灯 busy lamp ...

?占线灯信号

... visual-arc spectrograph 目视弧光摄谱仪 visual busy-lamp 占线灯信号，占线指示灯 visual check 外观检查，目视检查 ...