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If the canary gave signs of poisoning, the circular door would immediately shut and inject oxygen into a valve that came from a tank placed on top of the cage to relive it.The cruel practice of introducing canary islands to mines continued for almost 100 years, when in the 1980 s the canary.
We are a large-scale joint-stock enterprise integrating scientific research, production and sales.Our leading products have crushing equipment, sand making equipment, mobile crusher, etc., Each type of product is with complete specifications. All products have passed ISO9001, CE and GOST international quality system certification.