Certificate of registration prima facie evidence of validity.
Section 20
SEC. 20. Certificate of registration prima facie evidence of validity.—A certificate of registration of a mark or trade-name shall be prima facie evidence of the validity of the registration, the registrant's ownership of the mark or trade-name, and of the registrant's exclusive right to use the same in connection with the goods, business or services specified in the certificate, subject to any conditions and limitations stated therein.