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.
To use Triton, swimmers would bite down on a plastic mouth piece. Two arms, which branch out to the sides of the scuba mask, have been developed to function as gills. The scaly texture on the arms conceals small holes in the material where water is sucked in.