DAVIS, Circuit Judge.
This is an appeal from a decision of the Patent and Trademark Office Board of Appeals (Board) affirming the examiner's final rejection of appellants' claims 17-34 in application Serial No. 543,520, (January 23, 1975) entitled "Polymerization Catalyst." The Board's affirmance was based upon a holding of obviousness-type double patenting over the claims of three commonly-owned applications, in view of four prior art patents to others. We affirm...
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