L. HAND, Circuit Judge.
This is an infringement suit of the usual kind, upon patent No. 1,719,848, issued on July 9, 1929, to George M. Paulson; the invention was for a spark-plug in a gas engine. When such engines are idling, or running at low speeds, if the heat be too readily conducted off through the "sparking-point," the point as it cools will foul, interfering with ignition. On the other hand when the engine is running fast, the point will overheat, due to the...
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