How to extend laptop tablet computers warranty?

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How about Shanghai Lei Lin Industrial Equipment Co., Ltd? Shanghai Lei Lin Industrial Equipment Co., Ltd. is a limited liability company (natural person investment or holding) registered in Songjiang district, Shanghai. the registered address is located at No. 14, Lane 38, Nanyao Road, chudun town, Songjiang district, Shanghai.The unified social credit code/registration number of Shanghai Lei Lin Industrial Equipment Co., Ltd. is 91310117MA1J11YY9H, and Wei Weijie, the legal person of the enterprise, is currently in the opening State of the enterprise.The business scope of Shanghai Lei Lin Industrial Equipment Co., Ltd. is: industrial equipment, heat exchanger, air cooler, air condenser, direct air cooling system of power plant, residual heat pressure recovery of industrial furnace kiln, power generation and its system, double preheating system of blast furnace, water treatment device, compensator, absorber, filter, design, sales, installation, commissioning, maintenance and cleaning of dust collectors,

How can efficient water filters be made by hand? I don't know what your filter is.Some time ago, when I was in class, I led the children to make a water filter,I don't know if I can help you: use four disposable plastic cups,Each bottom has a lot of needles,Then put gauze,Put stones in the first cup,Put sand in the second cup,The third Cup has a broken cloth head in it,Put cotton in the fourth cup,The material inside each cup is clean,Filter the water from the cups with stones, sand, broken cloth heads and cotton in turn,Then you can get clean water.I don't know if this can help you.