796 PUBLIC LAWS-CHS. 161, 162-MAY 31, 1939 [53 STAT. supplies, and for the furnishing to such aircraft of mechanical service, Sale at cost. shelter, and other assistance. Except for shelter for which no charge shall be made, all such articles shall be sold and such mechanical service and other assistance furnished at the cost thereof to the Credit of amounts United States. All amounts received shall be credited to the appro- received. priation from which such cost was paid. Approved, May 31, 1939. [CHAPTER 162] AN ACT May 31, 1939 [H. R. 5447] Authorizing the President to invite the States of the Union and foreign countries [Public, No. 103] to participate in the International Petroleum Exposition at Tulsa, Oklahoma, to be held May 18 to May 25, 1940. Be it enacted by the Senate and House of Representatives of the International Petro- United States of America in Congress assembled, That the President leum Exposition, Tulsa, osition of the United States is authorized to invite by proclamation, or in President author- such other manner as he may deem proper, the States of the Union States and foreign and all foreign countries to participate in the proposed International countries to partici- pate. Petroleum Exposition, to be held at Tulsa, Oklahoma, from May 18 to May 25, 1940, inclusive, for the purposes of exhibiting samples of fabricated and raw products of all countries used in the petroleum industry and bringing together buyers and sellers for promotion of trade and commerce in such products. Dutiable articles SEC. 2. All articles which shall be imported from foreign countries imported for exhibi- tion, etc.; admission for the purpose of exhibition at the International Petroleum Expo- free,underregulations. sition or for use in constructing, installing, or maintaining foreign buildings or exhibits at the said exposition, upon which articles there shall be a tariff or customs duty, shall be admitted without payment of such tariff, customs duty, fees, or charges under such regulations Sales permitted. as the Secretary of the Treasury shall prescribe; but it shall be law- ful at any time during or within three months after the close of the said exposition to sell within the area of the exposition any articles provided for herein subject to such regulations for the secu- rity of the revenue and for the collection of import duties as the Secre- Poio. ticletary of the Treasury may prescribe: Provided, That all such articles, withdrawn, when withdrawn for consumption or use in the United States, shall be subject to the duties, if any, imposed upon such articles by the Deterioration allow- revenue laws in force at the date of their withdrawal; and on such an. articles, which shall have suffered diminution or deterioration from incidental handling or exposure, the duties if payable, shall be assessed according to the appraised value at the time of withdrawal from entry hereunder for consumption or entry under the general Marking require- tariff law: Provided further, That imported articles provided for herein shall not be subject to any marking requirements of the gen- eral tariff laws except when such articles are withdrawn for consump- tion or use in the United States, in which case they shall not be released from customs custody until properly marked, but no addi- tional duty shall be assessed because such articles were not sufficiently marked when imported into the United States: Provided further, Abandonedarticles. That at any time during or within three months after the close of the exposition, any article entered hereunder may be abandoned to the Government or destroyed under customs supervision, whereupon Transfer privilege any duties on such article shall be remitted: Provided further, That articles which have been admitted without payment of duty for exhi- bition under any tariff law, and which have remained in continuous customs custody or under a customs exhibition bond, and imported articles in bonded warehouses under the general tariff law may be
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