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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
Solar technology is currently progressively critical nowadays. With gas costs skyrocketing and also other varieties of house energy being incorrect, Solar energy will be the Earth's solution to guiding our lifestyles. Solar products certainly are a easy way to collect power from your Solar and control its capability to manage our families.
The Volkswagen Beetle is strong competitor of Mercedes Smart. It has a cute exterior design, with nice, curved lines, as the interior comes with a multi-functional sport controls, making the vehicle easy to control, plus a comfortable back-seat with plenty legroom, uncharacteristic for such vehicles. Its fuel economy is a little worse compared to the Smart, with 22 mpg/city and 31 mpg/highway, however the great safety features and excellent design ought to be sufficient cause to draw young drivers.
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