MR. JUSTICE MATTHEWS delivered the opinion of the court. He stated the facts in the language above reported, and continued:
A comparison of the two patents, for the purpose of determining the question raised as to the identity of the inventions described in them, requires an interpretation of the original patent in the light of the state of the art at the date when the application for it was filed. And we have the material for ascertaining its meaning, in that view...
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