To what types of mail and materials does this part apply?

§ 102–192.30 To what types of mail and materials does this part apply? (a) This part applies to all materials that pass through a Federal mail center, including all incoming and outgoing materials. This includes: (1) First Class Mail; (2) Standard Mail; (3) Periodicals; (4) Package Services; and (5) Express Mail. (b) This part does not apply to shipments of parts or supplies from a material distribution center. A material distribution center is a warehouse that maintains and distributes an inventory of parts and supplies.