Two patents are charged to be infringed in this suit. The court below held that the appellant presented no evidence of invention as to either. On this appeal appellant claims invention as to claims 2, 7, 8, 9, and 10 of patent No. 1,687,013. It abandons the other claims as well as the second patent litigated below, No. 1,804,549.
Patent No. 1,687,013 is an invention for improvements in the construction...
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