YA.LB LOOK MANUf'o CO. V. BCOVILL MANUf'û CO. 291 �series of metallic doors and metallic door frames, in combina- tion with a series of wooden pigeon-holes, for post^office boxes; said serie? of door frames being so constructed with relation to the woodwork, and so connected with each other, that the frames make a continuons frontage, no part of which can be removed on the outside without puUing down other parts and breaking the wood-work. The described method by which the frames were fastened to the wood-work, and were con- nected with each other, was by fitting the sides of the frames, provided with ears or legs, closely against the inaide of the pigeon-holes, and by riveting each frame through the ears within the pigeon-holes to the wood-work and to the four neighboring frames. The claims follow the specification in making this method of construction a necessary part of the invention. �The history of the art shows that the actual invention was broader than the patent. The invention was not simply an improvement in metallic fronts, but Yale was the first inventer of a praeticable metallic front. By the patent, Mb inven- tion was limited to a particular method of construction, or its equivalent, viz. : The frames must be riveted to each other through the wood-work, so that, if a rival simply riveted or fast- ened the frames to the wood-work, without fastening them to each other, (the flanges of the frames being sufficiently wide to cover the wood-work, and in sufficiently close .juxtaposition to repel entrance to the box from the outside,) the principle of the invention would be preserved, and its substantial advantages would be retained by a very simple modification of the pat- ented device. Instead of a single rivet, uniting the adjoining frames to each other, one or two rivets could be used, which ehould fasten the frame to the wood-work either from the inside or outside of the frames ; and although the structure could be more easily broken, yet practically the frames would be so con- nected to each other by close juxtaposition and tightly-fitting joints that the substantial advantages of the invention would be retained. �A re-issue was, therefore, desirable, and it was important to so enlarge the specification by amendment as to describe' ����
