[Code of Federal Regulations] [Title 19, Volume 2] [Revised as of April 1, 2006] From the U.S. Government Printing Office via GPO Access [CITE: 19CFR145.1] [Page 81] TITLE 19--CUSTOMS DUTIES CHAPTER I--BUREAU OF CUSTOMS AND BORDER PROTECTION, DEPARTMENT OF HOMELAND SECURITY; DEPARTMENT OF THE TREASURY (CONTINUED) PART 145_MAIL IMPORTATIONS--Table of Contents Subpart A_General Provisions Sec. 145.1 Definitions. (a) Mail article. ``Mail article'' means any posted parcel, packet, package, envelope, letter, aerogramme, box, card, or similar article or container, or any contents thereof, which is transmitted in mail subject to customs examination. (b) Letter class mail. ``Letter class mail'' means any mail article, including packages, post cards, and aerogrammes, mailed at the letter rate or equivalent class or category of postage. (c) Sealed letter class mail. ``Sealed letter class mail'' means letter class mail sealed against postal inspection by the sender. [T.D. 78-102, 43 FR 14454, Apr. 6, 1978]