The general law as now existing in all matters relating to taxation and the collection of delinquent and back taxes on tangible personal property not specifically provided for in sections 141.170 to 141.200 shall continue to be the law for counties of the first class, but nothing in this section shall be construed so as to extend any provision of sections 141.170 to 141.200 to include counties of the first class not having a charter form of government.