|
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
Friends and colleagues gathered to applaud worthy winners across seven categories – and recognise the creativity and dedication which underpin the whole sector’s contribution to the economy, to society and to customers, staff and stakeholders.
Btw, fantastic news to inform you that both GA5198F & GA5199F along with other Android Car GPS take presctiption 2016 Valentine Sale now, you are able to still enjoy the good deal with Free Dashcam R0003 deliver to Android units! Except Dashcam gift, free Camera A0119 is additionally deliver to the Vehicle specific Car DVD Players (D series), including Volkswagen, BMW, Ford units plus much more. Only 100 pcs of each one gift can be obtained!
Rudolf Diesel was born in 1858 in Paris to Bavarian immigrants Theodore and Elise Diesel. With the 1870 outbreak of the Franco-Prussian War, the Diesel family gone to live in London, when the war was over, young Rudolf attended deal with an aunt and uncle within the German capital of scotland- Augsburg. His parents wanted him to understand to communicate in German, and hoped he'd take interest in attending the Konigliche Kreis-Gewerbsschule, or Royal County Trade School.
New Car Buying Tips--
electric powered kayak
power plant electrical engineer
electric power components
liberty power electricity
electric power consumption formula
Copyright ?1998-2017 Technews Corp, All rights reserved
|
