When a cylinder comes in for a visual inspection, all accessories such as wraps and boots come off. Just like when your automobile is inspected, the old inspection sticker comes off. The cylinder has to be as "naked" as possible for a true examination. No, not every sticker has to come off, but you do probe the area under the sticker to see if there is a potential problem. If a problem is detected, then that sticker must be removed to see the damage clearly. If the cylinder meets standards both internally as well as externally, as well as passing an eddy current procedure if required, then a new sticker is applied, and the cylinder along with a copy of the documentation is returned to the customer. If it does not pass standards, such as having cracked threads, it can be condemned. A proof of visual inspection sticker shows that on a particular date, the cylinder met standards. There is no reason for more than 1 sticker to be on a cylinder as it can cause confusion as well as letting a cylinder that should be condemned to continue to be used if there is some time left on the old sticker.