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"When letters rogatory are addressed from any court of a foreign country to any district court of the United States, a commissioner of such district court designated by said court to make the examination of the witnesses mentioned in said letters, shall have power to compel the witnesses to appear and depose in the same manner as witnesses may be compelled to appear and testify in courts," 28 U.S.C.A., supra note II, § 653.

These provisions are now contained in 28 U.S.C.A.