Section 20
SEC. 20. Section II of the Act of the United States Congress approved October third, nineteen hundred and thirteen, entitled "An Act to reduce tariff duties and to provide revenue for the Government, and for other purposes;" title I of the Act of the United States Congress approved September eighth, nineteen hundred and sixteen, entitled "An Act to increase the revenue, and for other purposes and title XII of the Act of the United States Congress approved October third, nineteen hundred and seventeen, entitled "An Act to provide revenue to defray war expenses, and for other-purposes," are hereby superseded, except as herein otherwise provided, and except that they shall remain in force for the assessment and collection of all taxes which have accrued thereunder, and for the imposition and collection of all penalties or forfeitures which have accrued or may accrue in relation to any of such taxes.