EVAN A. EVANS, Circuit Judge.
This appeal involves the validity and infringement of three patents, to wit, Gullborg patent 1,307,733, Gullborg patent 1,307,734 and Zerk patent 1,475,980, all owned by appellee. Before considering the defenses to Gullborg's second patent, we must determine the effect of a recent decision of the Circuit Court of Appeals of the Sixth Circuit (
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