L. HAND, Circuit Judge.
The first patent was for a vestibule between two cars in what is called an "articulated train." This means that the adjacent ends of each car on the train are carried by a single truck, thus avoiding the need of two trucks for each car, and requiring but one more truck for the train than there are cars. The patent discloses such a train (part of which is the subject of the third patent), but claims only certain features of the vestibule, which...
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