SIMONS, Circuit Judge.
In a suit brought by the appellant as plaintiff below for infringement of Ricardo patent No. 1,474,003, for an internal combustion engine, the District Court found no infringement in the defendant's accused engine, made no decision as to patent validity, and dismissed the bill. The plaintiff appeals.
The patent relates to internal combustion engines of the four-cycle constant volume type, operating on the so-called Otto principle, which...
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