Sec. 1.331  Who may sign and issue.

    Subpenas requiring the attendance and testimony of witnesses, and 
subpenas requiring the production of any books, papers, schedules of 
charges, contracts, agreements, and documents relating to any matter 
under investigation or hearing, may be signed and issued as follows:
    (a) Hearings before the Commission en banc, an individual 
commissioner, or a panel of commissioners: By any commissioner 
participating in the conduct of the hearing.
    (b) Hearings before an administrative law judge: By the 
administrative law judge or, in his absence, by the Chief Administrative 
Law Judge.