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.
Going slower will cause these Off Shore Tackle Tadpole Diving Weights to run deep whereas going faster will cause them to rise and run shallower. This also applies to turns, the inside rods will run a little deeper and the outside rods will run a little shallower.