Method for forming reinforced foundation piles with an enlarged base
作者： Pickman Edgard
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lens.org 参考文章(3)
Holmes Arthur Brannam, Production of concrete piles ,(1948)
Blumenthal Maurice, Gardner Ernest Gilmore, Concrete pile and means for and method of producing same ,(1920)
Cleesattel Carlos Guillermo, Shoe for driving piles ,(1937)