MR. JUSTICE BUTLER delivered the opinion of the Court.
Three suits were brought by respondents against petitioner in the district court for the southern district of New York to restrain infringements, based on different patents for inventions in vacuum tube amplifiers which have been used in wire and radio telephony, talking motion pictures, and other fields. In all there were in suit seven patents. The cases were tried together and are treated as one. The lower courts...
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