Section 13. (a) Two signed copies of the certificate of limited partnership and of any certificates of amendment or cancellation, or of any judicial decree of amendment or cancellation, shall be delivered to the secretary of state. A person who executes a certificate as an agent or fiduciary need not exhibit evidence of his authority as a prerequisite to filing. Unless the secretary of state finds that any certificate does not conform to law, upon receipt of all filing fees required by law he shall:
(1) endorse on each duplicate original the word ''filed'' and the day, month and year of the filing thereof;
(2) file one duplicate original in his office; and
(3) return the other duplicate original to the person who filed it or his representative.
(b) Upon the filing of a certificate of amendment, or judicial decree of amendment, in the office of the secretary of state, the certificate of limited partnership shall be amended as set forth therein, and upon the effective date of a certificate of cancellation, or a judicial decree thereof, the certificate of limited partnership is cancelled.