HOUGH, Circuit Judge (after stating the facts as above).
Defenses insisted on in pleading and argument are lack of invention and noninfringement; but both produce a single position for defendants, who insist that Johnston's method is no more than a function of a well designed and operated Parpart machine, and all they do is to make tube by such a machine. Some study of the history of electric butt-welding of tubular forms should throw light on this contention, which...
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