… Envelopes, letter cards, plain postcards and correspondence cards, of paper or paperboard; boxes, …
Explanatory notes
… 48.17 ‑ Envelopes, letter cards, plain postcards and correspondence cards, of paper or paperboard; boxes, pouches, … in loose sheets or in blocks and certain other articles referred to below are, however, excluded . These articles … are designed for special purposes, e.g., demand notes, removal notices, advertisement letters, including such …