Appellants charged appellees with infringement of Claims 2 and 4 of United States Reissue Patent to Beazley, No. 18,944. The usual defenses were interposed, and the District Court, upon its special findings and conclusions of law, adjudged the claims valid, but not infringed, and dismissed the action.

The District Court rendered a written opinion in support of its rulings. 38 Fed. Supp. 756. We approve the rulings and the reasons therein stated.

•Judgment affirmed.