LENROOT, Associate Judge.
This is an appeal from a decision of the Board of Appeals of the United States Patent Office affirming the rejection by the examiner of claims 17 and 18 of appellants' application.
Said claims read as follows:
"17. A rust-proofing compound, comprising a granular or powdery substance containing high acid ortho-phosphates of iron.
"18. A rust-proofing compound, comprising a granular or powdery substance containing high...
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