L. HAND, Circuit Judge.
The very full and careful opinion of the District Judge makes it unnecessary for us to state the nature of the inventions, the scope of the patents and their claims, or the prior art. We refer to it and proceed at once to our own disposition. As to Sundback's patent the question of the validity of all the claims in suit except 18, depends upon the new feature of holding together the wings of the "slider" by a rivet to which the pull is attached...
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