Cores for manufacture of precast slabs
作者： Claude Baber , Smith Warner B
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lens.org 参考文章(4)
Karl P Billner, Expansible molding core ,(1949)
Eugene Freyssinet, Jean Seailles, Process for the manufacture of molded pieces or bodies from mortars or concrete ,(1930)
Mathews Charles B, Ambrose John G, Inflatable core for use in casting hollow concrete units ,(1945)
Nose Toichi, Device for constructing culverts of concrete ,(1925)