GARRETT, Associate Judge.
Hahn has here appealed from a decision of the Board of Appeals of the United States Patent Office, affirming a decision of the examiner refusing to allow three claims in an application for "Improvement in Tank Construction" as defining nothing patentable over prior art.
The alleged invention relates to metal tanks adapted for use as storage receptacles for material such as ashes, coke, coal, sand, etc.
The claims are as follows...
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