shaft signals
... 井筒信号记录器：shaft signal recorder 井筒信号：shaft signals 井筒设备：shaft equipment ...
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井筒信号记录器 shaft signal recorder
井筒信号电缆价格 MHYVR MHYVP MHYBV
·2,447,543篇论文数据，部分数据来源于NoteExpress
煤矿立井井筒的信号传输，由于其传输环境特殊，一直没有很好地解决。
The problems of the signal transmission in a shaft have not been solved because the transmission environment is very bad.
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信号工 要确保井筒内无人，才能发送升降信号。
Signal worker can't send hoisting signal until be ensure that no worker is in it.
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