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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
Electric Machines are based on various types of electronics or things relating to electronics, most notably household appliances or computer hardware. There are a few Electric Machines that are named after affiliated groups or programs instead, such as technology concept groups or movies featuring advanced technology.
Reviewer: dan4081 from United States: I bought the GA5150F and am extremely pleased. It's very fast, sounds great, great radio reception (it replaced an Alpine that had buttons that eradicated...it's hooked to a very elaborate system. Dynaudio speakers, Diamond audio sub infinite baffle inside a custom rear deck, Rockford 360.2 processor/eq.) 1. Steering controls work perfect each and every time. 2. Radio: shows song info adequately around the stations I tune in to in Florida...was very pleased to determine that. My Alpine didn't. 3. Has an iPod cable that connects to the back in the unit and it is cost my glove box...I haven't tried it. It also has 2 USB cables from the back this run for the glove box. I have all my music on the USB stick. When you go back for the home screen the song name and album art show while it's playing. It looks great. 4. Haven't streamed music by Bluetooth. Will try some soon. Interface looks good and is very quickly switching derived from one of source to an alternative. 5. It has all these USB and iPod inputs, plus has 2 micro SD slots for the front...one for GPS and the other for whatever music/video you desire. In summary, VERY happy with this particular purchase. This has been easily my favorite mod to my car...looks great, works great, really helps to make the car more modern and provides lots of options for entertainment in the vehicle.
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