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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
| The German auto producer Mercedes-Benz has long obtained {the distinction|the excellence|the difference} {of being|to be|for being} {a dependable|a reliable|the best} name {in the market|on the market|available in the market|out there} of producing high-class cars {along with|together with|in addition to|as well as} trucks, buses, and coaches {of the best|of the greatest|of the finest|of the most useful} quality {and very|and incredibly|and extremely|and intensely} useful engineering models. Founded in 1886, Mercedes-Benz {is the|may be the|will be the|could be the} earliest car manufacturer {to stay in|in which to stay|to remain in|to be} existence until today - {not to mention|as well as|not forgetting|let alone} {probably the most|one of the most|essentially the most|by far the most} established {regardless of the|whatever the|no matter the|regardless of} presence of other, {more contemporary|more sophisticated|modern-day|newer} suppliers {in the|within the|inside the|inside} international automotive scene.|Coupes {have always been|will always be|have been|have invariably been} {a desirable|an appealing|an attractive} body form for cars {due to the|because of the|as a result of|due to} general sporty look which {almost all|just about all|virtually all|nearly all} coupes {have written|wrote|showed} {all over|throughout|around|across} their body panels {as well as|in addition to|along with|and also} sex appeal {for some|for many|for a few|for a lot of} exotic European two door wonders. Being sleeker than sedans {and more|and much more|plus more|plus much more} streamlined than {even the|the|perhaps the|even} prettiest hatchbacks, {this form|this type|this kind|this manner} of two door vehicles is chosen by basically all automotive companies {with the objective|with the aim|for the exact purpose} {to build|to construct|to create|to develop} {something which|a thing that|something|an issue that} {is not only|isn't just|isn't only|is not just} aerodynamically fast {but also|but additionally|but in addition|and also} very {appealing to|attractive to|attracting|popular with} the masses. However, {there have been|there has been|there were|there are} some variations {in the|within the|inside the|inside} coupe design language {in recent years|recently|lately|in recent times} {and it is|which is|and it's also|in fact it is} {now not|no longer|not} unusual {to see|to determine|to find out|to view} {four door|4 door|car} coupes hogging the spotlight {from the|in the|from your|through the} traditional ones.
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