斜井提升应同时设立电铃和电话两套信号系统。
Bell signal systems and communication systems must be using at same time for decline hoisting system.
GX-1矿用隔爆型拉引信号开关适用于具有煤尘和爆炸性气体的煤矿井下，作为低压开关防爆电铃或其它小型声响设备。
GX-1Exploding isolation type drawing signal switch used for mining is applicable to coal mine where has explosive gas and coal dust.
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