HASTINGS, Circuit Judge.
This action was brought to enjoin and to seek an accounting for damages resulting from alleged infringement of two patents on inventions relating to valves and joint seals for large flows of high temperature, high pressure fluids. Appellant, James C. Hobbs, maintains that William Powell Company, by manufacturing and selling certain valves and joint seals, and the Wisconsin Power and Light Company, by buying and using these same accused structures...
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