Regulation .20 Service.

An original and three copies of all other pleadings, documents, testimony, or motions to be considered by the Commission shall be filed at the office of the Commission during regular business hours. All pleadings, documents, testimony, or motions shall contain a certificate of service indicating that the pleading, document, testimony, or motion has been mailed or served upon all designated parties to that proceeding and upon the Commission at its offices.