LENROOT, Judge.
This is an appeal from a decision of the Board of Appeals of the United States Patent Office affirming a decision of the Primary Examiner rejecting, for lack of invention over the cited prior art, claims numbered 7, 8, 9, 10, 13, 14, and 15 of appellant's application for a patent. No claims were allowed.
Claim 15 is illustrative of the subject matter involved and reads as follows:
"15. In combination with an airplane engine having a...
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