首页 > Term: guardian angel
guardian angel
A warning device affixed to the roof or back of a mine that automatically displays a visual indication when rock displacement begins.
- 词性: noun
- 行业/领域: 采矿
- 类别 一般矿业; Mineral mining
- Government Agency: USBM
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创建者
- ed.young
- 100% positive feedback
(Milwaukee, United States)