LENROOT, 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 Examiner, rejecting all of the claims of appellant's application, four in number, for lack of invention over the prior art.
Claim 1 is illustrative and reads as follows: "1. In a device of the class described the combination including a liquid supply tank, a carbureting chamber in communication with the tank, means...
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