LENROOT, Associate Judge.
This is an appeal from a decision of the Board of Appeals of the United States Patent Office, affirming that of the Examiner, rejecting all of the claims of appellant's application filed on December 1, 1926; said claims being numbered 1 to 5, inclusive; 7, and 9 to 13, inclusive.
Claim 1 is illustrative, and reads as follows: "1. In a piston of the class described comprising a head portion, a pair of downwardly extending bosses carried...
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