JACKSON, Associate 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 claims 4 to 7 inclusive and 12 to 14 inclusive of an application of appellant for a patent on a new and useful improvement in an Oxygen Regulator. Three claims were allowed.
Claims 4 and 5 illustrate the nature of the subject matter involved and read as follows:
"4. In an oxygen...
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