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From April 10 to 14, 2014, the fourth guiyang international automobile exhibition will be staged at the exhibition center of guiyang international conference. The auto show by the guiyang city people's government, Chinese automobile circulation association, China automobile industry international cooperation co., LTD., is exhibition co., LTD. Jointly organized, guizhou daily newspaper group seec, guiyang is exhibition service co., LTD., guiyang RGL convention and exhibition co., LTD., guizhou landscape charm advertising companies to undertake together, the guizhou metropolis daily for media, guiyang is as an executive organizer, conference and exhibition service co., LTD
The rapid development of air filters is closely related to the development of military industry and electronic industry. In the first world war, the use of various chemical agents, asbestos fibre filter paper as the smoke filter layer of military gas masks came into being. The glass fiber filter medium is used in air filtration to obtain a patent in the United States in October 1940. In the 1950s, the United States studied the production process of glass fiber filter paper, and the air filter was improved and developed. In the 1960s, HEPA filters came out; In the 1970s, the filter paper of fine glass fiber was used as the HEPA filter of filter medium, and the filtration efficiency of particle size of 013 micron particle diameter was 99.9998%. Since the eighty s, with the emergence of new test method, use evaluation to improve and to improve the filtering performance requirements, found the HEPA filter there is a serious problem, and he had a higher ULPA filter performance. Countries are still working on it and expect more advanced air filters soon
The audi sedan logo is four circles representing four companies before the merger. These companies used to be manufacturers of bicycles, motorcycles and buses. Since the company was originally a merger of four companies, each ring is a symbol of one of the companies.
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