RICH, Judge.
This appeal is from the decision of the Patent Office Board of Appeals affirming the rejection of claim 1, the only remaining claim of appellants' application No. 291,822, for a patent entitled "Method of Manufacture of Opaque Glass in Ribbon Form" on the ground of lack of invention over prior art.
The appealed claim reads:
1. A continuous method of manufacturing opaque glass in ribbon form from a slow setting glass composition which comprises...
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