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, refusing to allow the one claim involved in this application on the ground of public use more than two years prior to the filing date of the application involved, said date being March 23, 1928.
The appealed claim reads as follows: "1. In a liquid fuel burner, a draft pipe, a fuel pipe within said draft...
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