Gasket for concrete conduits
作者： Burl B Ohnstad
DOI:
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摘要:
lens.org 参考文章(4)
William B Kochner, Liquefier lid seal ,(1952)
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James P Hamilton, Bell and spigot tile and seal joint therefor ,(1960)
Poncel Maurice, Improvements in washers for sealing joints in pipes conveying aromatic hydrocarbons ,(1958)