19 U.S. Code § 1752 - Entry of articles for fairs
Any article imported or brought into the United States—
(1) which is in continuous customs custody, covered by a customs exhibition bond, or in a foreign trade zone, and
may, without payment of any duty or internal-revenue tax, be entered under bond under this section for the purpose of exhibition at a fair, or for use in constructing, installing, or maintaining foreign exhibits at a fair.
Source(Pub. L. 86–14, § 3,Apr. 22, 1959, 73 Stat. 18.)
Immunity From Seizure Under Judicial Process of Cultural Objects Imported for Temporary Exhibition or Display