HATFIELD, Associate Judge.
This is an appeal from the decision of the Board of Appeals of the United States Patent Office affirming the Primary Examiner's decision rejecting claims 17 and 18 in appellant's application for a patent for an invention on a magnetic core, on the ground of lack of invention over the prior art. Claims 1, 3, 8 to 13, inclusive, 19 and 20 of the application have been allowed.
The appealed claims read:
"17. In a magnetic core...
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