O'CONNELL, Judge.
This is an appeal from the decision of the Board of Appeals of the United States Patent Office affirming the decision of the Primary Examiner rejecting three claims, numbered 43, 44, and 45, of appellant's application for a patent for improvements in a regulator whereby the air pressure within an airplane cabin may be maintained at predetermined pressures for different flight altitudes. Thirteen claims were allowed by the Primary Examiner.
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