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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
Construction blockade or the opening of the scheduling command, train dispatcher must obtain the request of the station attendant (CTC section station attendant station, by the construction unit head requests), before release.
The Razor scooter can be a folding scooter which was formulated with the J.D. Corporation. The Razor Scooter was obviously a project that's tackled by Gino Tsai. Gino was during the time Chief Executive of J.D. Corporation, in Taiwan.The account goes that Gino Tsai derived the idea for your Razor scooter as a consequence of his short stature which it took him too enough time to walk around his extensive bicycle factory in Chang Hua. The solution to defeat this problem ended up being go ahead and take old fashioned type scooter and provide it a radical modernisation. Subsequently several years later the Razor scooter came to be.
Porsche's English logo used the surname of Ferdinand porsche, the founder of the German porsche company. The logo adopts the shield city emblem of Stuttgart, where the company is located. The word "PORSCHE" is at the top of the logo, indicating that the trademark is owned by PORSCHE design company; The "STUTTGART" in the logo is above the horse, indicating the headquarters of the company in STUTTGART. In the middle of the trademark is a horse, which indicates that Stuttgart is rich in a kind of famous horse; The upper left and lower right of the trademark are antler patterns, indicating that Stuttgart used to be a good place to hunt. Trademark upper right and lower left the yellow stripe on behalf of mature wheat color, refers to the grain and make it plentiful and black in the trademark represents fertile land, in the trademark red symbol of the wisdom of the people and for the love of nature, thus formed a deep, exquisite and delicate beautiful pastoral landscapes, shows porsche glorious past, the future of the company and indicate the porsche, porsche's sports car to excel.
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