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canary in a coal mine

Oct 19 2020 · canary in a coal mine Something or someone who due to sensitivity to his her or its surroundings acts as an indicator and early warning of possible adverse conditions or danger Refers to the former practice of taking caged canaries into coal mines The birds would die if ...We are a professional mining machinery manufacturer, the main equipment including: jaw crusher, cone crusher and other sandstone equipment;Ball mill, flotation machine, concentrator and other beneficiation equipment; Powder Grinding Plant, rotary dryer, briquette machine, mining, metallurgy and other related equipment. which can crush all kinds of metal and non-metallic ore, also can be dry grinding and wet grinding.If you are interested in our products or want to visit the nearby production site, you can click the button below to consult us.Welcome to our factory to test machine for free!

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