Prefabricated steel joist adapted for the reinforcement of floors
作者： Tersigni Ennio
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lens.org 参考文章(4)
Earl J W Ragsdale, Open truss girder ,(1930)
Rafter Albert, Stud and rafter ,(1936)
Fatosme Albert, Perfectionnements aux constructions préfabriquées ,(1960)
Chauncey F Lufkin, Metallic railway-tie. ,(1902)