Section, act Aug. 16, 1954, ch. 736, 68A Stat. 801, related to a tax credit or refund to any person who has sold to a State, or a political subdivision thereof, any article containing any oil, combination, or mixture, upon the processing of which a tax has been paid under former section 4511, and to a refund to the exporter of the tax paid under former subchapter B of chapter 37.