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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
As I discussed earlier there are many, many methods touted about for removing scratches from discs but as an important note NONE of these connect with the brand new Blu-Ray discs. Blu-Ray utilises quantity plastic to generate the discs and then for any in the methods mentioned here will definitely create a destroyed Blu-Ray disc.
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Of course, repairing a damaged alloy wheel could be tricky. Many believe that a cracked or bent wheel can just be bent back into place, nevertheless it isn't that simple. Fortunately, we of experts includes a technique of safely repairing a damaged wheel which will remove even unnoticeable cracks or another weak spots. The wheel is mounted on a car simulator, so when heat, pressure and light-weight vibrations are put on the wheel the alloy moves back to place without cracking. The wheel retains its original strength once it cools. It is also washed thoroughly, since brake dust and rust can hide small cracks. Once the wheel is restored and cleaned, it really is inspected thoroughly by all of us of experts.
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