PER CURIAM.
The District Court dismissed plaintiffs' bill for infringement, based upon patent No. 1,522,577, January 13, 1925, issued to plaintiffs for a method of excavating. The patent was held to be invalid, even if infringed. We have given thorough consideration to the criticisms made of the opinion below, and we think it must be affirmed.
Well before Connelly's appearance, Greenwood had applied to tunnel excavation a method which was essentially that...
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