DENISON, Circuit Judge.
The court below dismissed the infringement suit brought by the appellant, as plaintiff, based upon the Bentson patent, No. 1,246,527, dated November 13, 1917, for an improvement in trenching machines. This patent had to do solely with an improvement, consisting of a spring cleaning device, by which the buckets on the continuous chain would be automatically cleaned by a resilient scraper. The court found that the patent involved invention and...
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