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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
Salmon is tasty pan fried or cooked about the Barbecue. As with the baking technique, you are able to pan-fry or BBQ salmon without seasoning or it is possible to add sea salt & add spice to or possibly a herb crusting. Once pan-fried, the exterior of the seafood can become crispy, particularly if maintain the skin. Spray the fish with extra virgin extra virgin olive oil spray or brush it with olive oil right before cooking over a medium-high heat right until it really is cooked (generally about 4-5 mins on both sides.) Serve the salmon using your favorite combination of greens or maybe vegetables.
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