MACK, Circuit Judge.
For the third time we are called upon to consider an alleged infringement of Alleyn patent, No. 995,758, for the anti-friction tips for furniture, designed to replace casters and known as "domes of silence." The single claim of the patent reads:
"In an article of manufacture, a tip for supporting wooden chairs and the like, adapted for contact with a support therefor, consisting of a continuously curved convex portion of smooth sheet metal...
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