This is an appeal from a judgment of the District Court in a patent infringement case, in which the court directed a verdict for the appellee. 1 Appellant, in addition to challenging the directed verdict, urges that it was error to exclude reports of certain tests and the testimony of proffered witnesses on engineering issues and on damages.

We have carefully examined all of the claims of error in light of the record and find no error warranting reversal.

Affirmed.