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ZH serial Chemical Oxygen Self-Rescuer is a kind of closed-loop circulating respiration protecting device. It makes the exhaled air react with the chemicals to produce oxygen.
ZY serial Compressed Oxygen self-rescuer is a kind of lsolation type closed circuit individual respiratory system protective device that use compression oxygen as gas source.
ZL serial filter self-rescuer is a kind of portable breathing protective device especially to filter and convert CO into CO2 for underground coal miners

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