§  1.258   Closing of the hearing.

   The record of hearing shall be closed by an announcement to that effect
   at the hearing by the presiding officer when the taking of testimony
   has been concluded. In the discretion of the presiding officer, the
   record may be closed as of a future specified date in order to permit
   the admission into the record of exhibits to be prepared: Provided, The
   parties to the proceeding stipulate on the record that they waive the
   opportunity to cross-examine or present evidence with respect to such
   exhibits. The record in any hearing which has been adjourned may not be
   closed by such officer prior to the day on which the hearing is to
   resume, except upon 10 days' notice to all parties to the proceeding.