Sec. 591. Standards of export; establishment; shipping without certificate forbidden; hearings. 592. Notice of establishment of standards; shipments under contracts made before adoption of standards. 593. Foreign standards; certification of compliance. 594. Exemption of minimum quantities. 595. Fees for inspection and certification; certificates as prima facie evidence. 596. Refusal of certificates for violations of law; penalties for violations. 597. Rules and regulations; cooperation with other agencies; compensation of officers and employees; effect on other laws. 598. Separability. 599. Definitions.