Self-sealing valves for multiwall bags
作者： Means John W , Moore Kenneth L
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lens.org 参考文章(2)
Floyd D Gottwald, Valve for bags ,(1943)
Clyde D Pierson, Peters Harry, Sleeve for bag valves ,(1949)
作者： Means John W , Moore Kenneth L
DOI:
关键词:
摘要: