HATFIELD, Associate Judge.
This is an appeal from the decision of the Board of Appeals of the United States Patent Office affirming the decision of the primary examiner denying all of the claims, 19 to 23, inclusive, in appellant's application for a patent for an alleged invention relating to improvements in a refrigerating system of the absorption type.
Claims 20 and 21 are illustrative. They read:
"20. In a system of refrigeration comprising a chamber...
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