Which marking is not required for cylinders that have passed inspection?

In the context of markers on cylinders that have passed inspection, the inspector's name is not a required marking. While other information is crucial for maintaining safety and compliance with regulations—such as the Retest date, Test date, and the Registration Identification Number (RIN)—the inspector's name does not need to be included. This is primarily because the other markings serve to track the history and safety of the cylinder, ensuring that records are kept accurately about its testing and maintenance schedule. Thus, while accountability of the inspector is important, their name is not a mandatory requirement on the cylinder markings, allowing for a streamlined approach to tracking compliance and safety standards.