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Update time: 2018-05-29

● mine mobile Nitrogen Patent Number: 200,920,119,097.2 ● dispersion means oxygen Patent Number: 200,920,114,298.3 ● cost pressure swing adsorption air separation process technology Patent Number: 200,910,100,711.5 ● mine mobile screw compressorPatent Number: 200920113553.2

The last one：2008 quality management system certification in 2009
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