O'CONNELL, Acting Chief Judge.
This is an appeal from the decision of the Board of Appeals of the United States Patent Office affirming the final rejection by the Primary Examiner of claim 28 of appellants' application, No. 300,938 for a patent on a method of preparing paper stock. Three apparatus claims have been allowed, but claim 28 was rejected as unpatentable over the cited prior art.
The appealed claim reads as follows:
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