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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
This year, Oscar-winning actor Colin Firth was rewarded a CBE (Commander from the Order from the British Empire), giving him a golden possibility to personally ask the Queen by what she considered his performance as her father King George VI in 'The King's Speech'. Just months after Firth, 50, took home the Academy Award, he enjoyed the regal pomp and pageantry of Buckingham Palace legitimate.
Homeowners are inundated with rising expenses and discovering the modern strategy to produce free electricity employing a magnetic power generator may be helpful in saving cash on heating expenses. It differs from a solar powered sort of generator. Unlike the solar, wind and ponds of generating energy, it's self-perpetuating and never dependent upon external forces.
China's first production country, gradually developed into the world tire industry has been built all kinds of complete series of products of complete industrial system, and obtain a series of original innovation characteristics of international frontier technology progress. China's heavy-duty meridian has reached the advanced level of the world through high speed and high load test. The radial tyre of the sedan has achieved no inner tube, wide section, flat and high speed. The safety, energy conservation and environmental tyre of the international trend have been steadily pushed into the international market and gained recognition
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