§ 503.
Facilitating work of foreign traveling salesmen; licenses and certificates of identification
Whereas the United States has entered into conventions with the Governments of Uruguay, Guatemala, Salvador, Panama, and Venezuela which were signed on August 27, 1918, December 3, 1918, January 28, 1919, February 8, 1919
([Sept. 22, 1922, ch. 414], [42 Stat. 1028].)