MANTON, Circuit Judge.
This suit is for infringement of the Upson patent No. 1,957,237 granted May 1, 1934, for a fan blade and a design patent to Gosling No. 89,076 granted January 24, 1935 for an electric fan.
Claim 7 of the Upson patent is sued on. It reads: "In a fan, a plurality of blades each having a leading edge and a trailing edge and a surface of gradually increasing pitch from the leading edge to the trailing edge of the blade, the combined area...
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