Parties to a proceeding before the commission may obtain discovery in preparing their case. Discovery shall be conducted in accordance with the procedural provisions of the "Ohio Rules of Civil Procedure." Depositions may be taken and may be used by any party in the same manner and to the same extent as is permissible in the common pleas courts of this state. The party taking the deposition shall pay the costs of the deposition. The use of a deposition in lieu of the deponent's oral testimony at hearing shall be allowed under the same provisions as are articulated in rule 32 of the "Ohio Rules of Civil Procedure." A party desiring to use a deposition, or any designated part thereof, at hearing shall file the deposition with the commission and serve written notice to every other party at least five days prior to hearing. At hearing, a party may object to receiving into evidence any portion of deposition testimony in the same manner and for the same reasons as if the deponent were testifying in person at the hearing.