Public [act] 428-632, 68th Congress. Jurisdiction. S. 3913, act to extend for additional period of 1 year effective period of act to amend sec. 51 of chapter 4 of Judicial code [relating to Jurisdictions of District Courts] and [to extend for additional period of 3 years] act to amend sec. 876, Revised statutes [relating to issuance of writs of subpoena in certain cases].