WHITAKER, Judge.
Plaintiff alleges that he was the true, original, and first inventor of certain new and useful improvements in differential pumps, a patent on which was granted him on May 25, 1942. He sues because he says that the defendant on June 1, 1942, issued specifications for a pump-type fire extinguisher which embodied his invention, and that the defendant had caused large numbers of manufacturers to manufacture and sell to it pumps made in accordance with...
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