The clerk shall have the custody of the seal of the commission; have general charge of the office; keep a full record of its proceedings; file and preserve at its office all documents and papers entrusted to his or her care; prepare such papers and notices as may be required of him or her by the commission; and perform such other duties as it may prescribe. The clerk shall have power to issue subpoenas for witnesses and to administer oaths in all cases before the commission or pertaining to the duties of the office.