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True enough, such a rewarding option has also helped car makers like Toyota to learn from this new development. One of the top model hybrid cars of this Japan-based car manufacturing, the Prius, has been the optimum target of clients because of their transportation needs today. And mind you, the Prius doesn't come cheap. One unit alone costs $32,000, not a cheap price to pay for hybrid cars offered for the greener outlook nowadays.
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
In 1986 inventor Kalvin Klundt designed the very first two long handle giant bubble maker called Dip Stix?. He was later granted two US patents (4943255 & D306465) on his design. It used two long rods to support and control the flexible bubble loop created from a unique round cord using a double coil. The loop absorbs and releases the big level of bubble solution had to create huge bubbles.
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