tly invented and patented a railroad U. S. circuit Court.—Eastern District of Pennsylvania. frog over which locomotives and cars may pass as Wright v. Postel. smoothly as upon a continuous track. In this inven- Butler, J.: tion, which is illustrated by the annexed engraving, at Letters patent No.… … It is the duty of inventors to use reasonable dili- LAESEN'S DUMBWAITEE. BAIRD'S IMPROVED RAILROAD FROG. gence in reducing their conceptions to practice and applying for patents when desired, and they cannot around a pulley at the lower end of the waiter shaft, tracks the rails are removed, and a…
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