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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
Cell phone spying software gives you one way that one could track your young ones on your own terms. Not only does spy software turn the cellular phone in to a GPS locator, it does much, a lot more. Most cell tracking software available on the market now allow you to get copies of texts, emails, call logs, contact records, and also pictures and videos. Just think: you are able to join anytime to see where your son or daughter is found by tracking their mobile phone. So if your son or daughter doesn't come home for curfew, you are able to see exactly where they may be. Or if you want to check to see if your kids caused it to be home at school, you are able to see that too.
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