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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
On October 21, 1879, Edison's electric lighting experiment could be regarded as modern technology research
Space probe: space probe, deep space probe or space probe. Unmanned spacecraft, the main instrument of space exploration, to explore the moon and the moon in distant objects and space. Space probe loading of scientific instruments, by a rocket into space, fly close to the moon or the planets for close observation, do satellites for long-term observation, landing field or samples for research analysis
The truth in the matter is: You can repair bad sectors on your own hard disk. Sign up to read error and bad mistakes I / O on the harddrive isn't the sort of problem can be corrected or ignored. What follows is definitely an explanation of how the tough drives are made and the way a poor sector that appears the system is with a slippery slope to disaster.
It?s a truth, buildings move. Tiny shifts in underground stability or building settlement may cause cracks within your shower or bathroom. There are other causes, but a crack inside wall and floor junctions or even in between grouting and tiling causes massive problems to the wall and floor behind them. By using the DiaOSeal system developed by Shower Repairs Plus, they are able to repair, re-seal and still provide a water-tight shower or bathroom with a very long lasting finish. The DiaOSeal Hydro-barrier can be a clear liquid that seals the tiled area, stops further leaks which is totally non-invasive.
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