KENT, Chief Judge.
This suit involves the validity of United States Patent No. 2,291,158 issued to Axel Harald Holstensson on July 28, 1942. The action is instituted for damages alone and there is no request for an injunction against infringement of the patent since the patent has expired.
It is the theory and claim of the plaintiffs that the patent is valid and has been infringed by the defendant.
It is the defendant's claim that the patent is invalid...
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