LENROOT, Associate Judge.
This appeal brings before us for review a decision of the Board of Appeals of the United States Patent Office, affirming a decision of the Examiner rejecting claims 13, 15, 16, and 17 of appellant's application upon the ground that they are not patentable in view of the cited prior art.
Claim 13 is illustrative of the claims in issue, and reads as follows: "13. In a variable pitch air propeller, a hub secured to the propeller shaft...
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