JACKSON, Judge.
This is an appeal from a decision of the Board of Appeals of the United States Patent Office affirming a decision of the Primary Examiner finally rejecting as unpatentable over the prior art three claims of an application of appellant, serial No. 643,132, filed January 24, 1946. One claim was allowed.
The rejected claims read as follows:
"10. In combination, a furnace having vertical walls and a horizontal grate, a vertical combustion...
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