Wis. Admin. Code § Tax 9.41 — Vending machines

Each vending machine operator shall place on the front of each vending machine operated or controlled by the operator a sticker listing the operator’s name, address and vending machine operator’s permit number as issued by the department, in such a position that it will not become dislodged or detached. The sticker may be placed behind the glass, provided it is completely visible and readable from the front.