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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
August Horch was created in Moselle in 1868 and educated in Mittweida. He obtained an engineering degree by 1890 and started for Carl Benz in 1896. He worked inside the company for three years only, gaining whatever knowledge he required and in 1899 create his or her own company August Horch & Cie. For an entrepreneur, August Horch lacked experience, but he made up because of it in knowledge of automobile engineering.
The first tires were made of wood, which can be seen from ancient Chinese chariots and foreign gentlemen's carts. Later, when explorer Columbus explored the new world in 1493-1496 for the second voyage to the island of haitians in the west Indies, he was taken aback by the fact that the local kid was playing with a hard piece of rubber. Later, he brought this wonderful thing back to his homeland. After several years, rubber was widely used, and the wheels were gradually made from wood to hard rubber. But the rubber tires were solid, and they were uncomfortable and noisy. It was not until 1845 that the Scottish civil engineer, r.w. Tom, made the inflatable tyres and got the British government's patent for "the wheels of carriages and other cars". The first inflatable tire was born on December 10 of that year. The first man to buy a pneumatic tyre called a list, a nobleman, and the price of four tires weighed forty-four pounds and two shillings. In 1847, scientific American magazine introduced Tom's inflatable tire, calling it an epoch-making improvement. The British, however, too much attention to the traditional gentleman, in order to protect the carriage, limiting the development of the steam car, the speed of cars in urban areas are limited to 2 mile per hour (3.2 km), suburbs of 4 mile (6.4 km). In this way, Tom's invention had no market, so it was gradually forgotten. That is to say, Tom's first tyre revolution did not bring the sun the same light as the sun, for the darkness that human beings should endure seems to have not come to an end. But the sun is always out, because of the human and all things need it, more than 40 years later, in 1888, England people in Ireland when veterinary j. b. Mr Dunlop taken out a patent on the pneumatic tyre. At that time, Mr. J. b. Dunlop 10-year-old son Johnny bought a tricycle, but because the tires are made of hard rubber solid tyres, therefore, walking on the road is full of stone is very uncomfortable, son's complain inspired Mr Dunlop, therefore, been forgotten more than forty years of pneumatic tyre came out again. Along with the progress of The Times, invented by Mr Dunlop pneumatic tyre soon have been applied on the bike, and quickly to the automobile industry, for the world made great contributions to the development of automobile industry
Going on 2 weeks now. I've played with just about everything I value with this unit. GPS: I use Waze and MapFactor for gps. MapFactor for offline navi. Radio reception: I'm in Hawaii and it is all totally pretty strong will likely alteration of 7 months when I move returning to the mainland. I mostly listen to MP3s anyway. Bluetooth: No problems connected for music or calls. I saw some comments concerning the mic. I use this everyday and everyone I talked with can hear me clearly. Video: I use MX Player and it works great. DVD will be as expected. Audio: No problems with audio. When the volume is 0. I can hear the faint wifi buzz when working with wifi. it is quite faint. Volume on 1, I can not listen to it. OS/Wifi: I pretty much purchased this unit because of the of the 2 capabilities. I am not disappointed. Basically it's actually a tablet to your car. Illumination: Works with the lights because it is suppose to. Love the custom color option. No flickering noted. I have even an amp, two 12in woofers along with a cap within the trunk. I guess the screen brightness would bother people at night. I have no difficulties with it. I don't know whether or not this features a auto feature but the app screen lock will shut off your screen. Screen Mirroring: Don't really value this feature sense, as I talked about earlier, readily stored away a tablet for the car. I did attempt to get this to work, but I has not been successful. I did not put 100% effort into this. Most states have laws have you been are not allowed to be holding an electronic device while driving, so I do not require this feature. Steering Wheel Controls: No issues. Works similar to my GA5150 did. The call button does not work because it did for factory unit. This was not a deal breaker for me personally.
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