HATFIELD, Associate Judge.
This is an appeal from a decision of the Board of Appeals of the United States Patent Office affirming the decision of the Primary Examiner rejecting claims 7 and 11 in appellants' application for a patent for an alleged invention relating to an apparatus for manufacturing gas from coal.
The claims read:
"7. An apparatus for manufacturing gas from coal comprising an externally heated tumbling barrel retort divided into sections...
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