DAVIS, Circuit Judge.
In this suit for infringement of claims 4, 5, 10, 14, 17, and 19 of the Johnston patent, No. 1,388,434, for a new and improved method and apparatus for butt-welding thingauge tubing, and of claims 3, 5, 6, and 9 of the Johnston patent, No. 1,435,306, for the product of the process, the District Court held both patents valid but limited their application to operations conducted at a speed in excess of thirty feet per minute. Both the plaintiff...
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