Storage is widely considered in economic dispatch (ED) problems. To prevent simultaneous charging and discharging of a storage device. a storage-concerned ED problem should involve complementarity constraints for every storage device to make the problem strongly non-convex. In this case. https://www.spidertattooz.com/Kaiser-Copy-Stand-RS-1-with-RA-1-Arm-40-Counterbalanced-Column-and-18-x-20-Baseboard/