Filtering apparatus and method of making it
作者： Lloyd C Knox , Jr Erskin L Medford
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lens.org 参考文章(2)
Kasbohm Martin L, Dellinger Hartley C, Fayerweather Jr Bruce L, Gradated bed flash arrester ,(1961)
Duenkelberg Friedrich Wilhelm, Improved Apparatus for Purifying Water ,(1907)