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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
Peugeot began its reign in motorsports since the start with the entering five cars for your Paris-Rouen Trials in 1894. These motorsport trials are largely thought to be the 1st motor sports competition. It was not until 1912 that Peugeot made its perhaps most obviously contribution to motor sports when one of several entered cars won the French Grand Prix. This winning Peugeot car was advanced and influential for later designs since the Peugeot featured a dual overhead cam configuration with four valves per cylinder. The Peugeot innovation made it in a way that the engines could possibly be smaller and kick out maximum horsepower versus depending upon larger heavier engines to obtain the desired horsepower.
Young Diesel graduated on top of his class in 1873 and going to the Industrial School of Augsburg. Two years later he enrolled in the Royal Bavarian Polytechnic in Munich. He would have graduated in July 1879, but he was sick with typhoid fever. He graduated in January 1880 and moved to Paris. There, he went to work for his former professor Carl von Linde within the construction and design of an refrigeration and ice plant.
To stop on the road to set up checked posts ZhaChe, imposed on the phenomenon of disorderly buckle, resolutely correct unhealthy tendencies in some industries and promote economic, cultural exchanges and safeguard the legitimate rights and interests of the masses of the people and enterprises, provincial people's government decided to clean up checkpoints on the roads around the (card). The issuing order is as follows:
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