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Author: WikiMatrix
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English[en]
The Pratt truss was patented in 1844 by two Boston railway engineers, Caleb Pratt and his son Thomas Willis Pratt.
Chinese[zh]
普拉特桁架(Pratt truss)是由二位波士顿鐵路工程師在1844年申請專利,他們是Caleb Pratt及他的兒子Thomas Willis Pratt。