Nos. 351 and 352, in Supreme Court of United States, Oct. term, 1949, no. 351, American Dredging Company, claimant and owner of tugs, James N. Knipe and Arthur N. Herron, v. United States; no. 352, American Dredging Company, individually and as owner of dump scows no. 116, no. 120 and no. 122, v. [same], on petitions for writs of certiorari to court of appeals for 3d circuit; brief for United States in opposition.