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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 Tokyo motor show is a relatively short history of the five major auto shows, known as the "Asian car weathervane", which was founded in the 1950s and was held in the autumn of the last century. The Tokyo motor show is the largest international motor show in Asia. The first international auto show began in 1954. Tokyo has a deeper impact on the world car market and is of greater importance to the Asian auto market. The exhibition, held in chiba prefecture, near Tokyo, Japan, offers a variety of electronic 3d display equipment that gives visitors a sense of "vertigo". The Tokyo auto show in 1999 set a world record of 1.4 million visitors and saw its excitement. Compared with other major western auto shows, the Japanese auto show has more Asian Oriental charm. Japanese manufacturers have a number of small, elegant, high-end cars that can be the main character of the auto show. The Tokyo auto show takes turns showing cars and commercial vehicles each year, and the 2003 Tokyo auto show focuses on commercial cars and motorcycles. The Tokyo motor show has a distinctive feature: a variety of small, diverse cars from Japan's local carmakers have traditionally been the main actors in the show. At the same time, various car electronic equipment and technology are also a highlight of the exhibition
Adults prefer to improve their parties with something somewhat risqu? once in a while. There are numerous approaches to incorporate a grown-up vibe in to the birthday celebration theme. The most important factor is if the guest of honor will like a adult party theme. It doesn't have to be bawdy to own adult party games.
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