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介绍了井下两道风门不能同时敞开的自动闭锁与监测装置的原理，该 装置在铁法矿务局大隆矿使用一年多来性能可靠，对安全生产起到了显著作用。
The principle of automatic locking and monitoring device which can not be opened at the same time is introduced. The device has been used reliably for more than a year in Dalong Mine of Tiefa Mining Bureau, and has played a significant role in safety production.