High pressure valved filters
作者： William A Thomas
DOI:
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摘要:
lens.org 参考文章(6)
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Mathias Weiwoda, Combination strainer and separator. ,(1915)
Julius P Kovacs, Multiple stage filter ,(1953)
Otto A Maunula, Filter control valve ,(1948)
James L Edelen, Attaching thread for glass bowls ,(1949)