There are two ways to tell if the timing belt has been replaced. One is obvious-you are looking at a service receipt showing the replacement.
Swimlane diagrams are used whenever you need to show activities, tasks, or process steps which are being performed by different actors/roles. You can use swimlanes to group activities in an activity diagram or process flow by any category what you need: by role, by system, by department, etc.
One lesser known use of sharkskin fabric is as a liner in diving suits and wetsuits in general. The smooth texture of the material feels good against the skin and also has a tendency to stay in place as the suit is put on or taken off.