maintenance people and all the parts and everything we need to keep the robots going 24 hours a day. once in awhile they ll break down but our guys repair them. we have what we call the barn where the robots go to charge and get repaired and we get them back online as soon as possible. this is kind of a dinosaur in the industry. you have to trouble shoot a lot. a lot of times electronics don t failout vite. they get glitchien an it s had 23 years to get glitchy sue. senior agv technician adams runs the workshop. we have parts for that. it s basically the electronics that are obsolete. they don t make them anymore. we re doing constant maintenance. this is pretty brutal environment for electronics. you can hear them bumping and grinding down the guide path over crumbling expansion joints. they take a beating but they keep on doing the job. but since they each weigh 1600 pounds it s best to stay out of their path.