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, in view of the prior art, claims 3, 4, and 5 of appellant's application for patent. No claims were allowed.
Claim 3 is illustrative of the claims before us, and reads as follows: "3. In an electrolytic cell working with a mercury cathode, the arrangement of a level positioned iron piece selected...
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