SPARKS, Circuit Judge.
By this complaint Water Hammer Arrester Corporation sought a declaratory judgment against the defendant relative to United States patent to Tower, No. 2,273,766, issued February 17, 1942, upon an application filed August 4, 1940. The alleged invention covered by the patent relates to a water hammer arrester, or other energy absorbing appliance of the type in which abnormal impulses or fluctuations in pressure of water or other liquid in a pipe...
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