In any civil action resulting from the provisions of this subtitle, the landlord shall bear the burden of proving that the tenant has been provided with the notice required by either § 9-2 or 9-6 of this subtitle, as the case may be. It shall be a rebuttable presumption that the landlord has satisfied said burden if he can produce said notice with the tenant’s signature affixed thereto. It shall be a rebuttable presumption that the landlord has satisfied said burden for any tenants who were tenants at the effective date of this subtitle if the landlord can produce a proof of mailing to current tenants of whom the landlord has actual knowledge. City Code, 1976/83, art. 13, §66 Ord. 82-754